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A joint solution for traction power control

With investment in the UK rail network growing but under continued scrutiny to ensure maximum efficiency is achieved, it is essential that the supply chain is able to bring new and innovative technologies and solutions to the market.

Network Rail’s target for investment during CP5, and forward into CP6, is to focus on infrastructure improvements. This covers not only signalling renewal programs but also the introduction of additional electrified routes to support the new trains being supplied as part of the Intercity Express Program (IEP).

Essential to electrification is the control of traction power from electrical control rooms using centralised SCADA (supervisory control and data acquisition) equipment. As a result, Network Rail is investing in a major SCADA renewals program across the electrified network.

Having already worked together on significant integration projects for London Underground, Hima-Sella and Mitsubishi Electric UK saw an opportunity to combine their industry expertise and proven COTS (commercial off-the-shelf) products to design a modern, cost-effective remote terminal unit (RTU) for traction power substation control.

Drawing upon its 42 years’ experience as a system integrator delivering safety critical control applications, Hima-Sella developed the Tracklink® RTU. This uses a traction power control combination of proven ‘COTS’ Mitsubishi PLC (Programmable Logic Controller) software and hardware, plus the design of industry specific interface technologies, to provide a simple and cost effective solution for substation control.

The two companies have subsequently entered into a formal collaboration and supply agreement, designed to ensure long-term commitment to each other and their customers, for the supply and support of the Tracklink RTU solution over its entire asset life. This agreement underpins their pursuit, delivery and long-term support of substation automation projects across the UK.

Technology overview

The Tracklink RTU has been designed to meet the requirements of new and legacy installations as a flexible solution for substation applications. It can be supplied in a single wall mounted or floor standing cabinet or as a distributed solution, and meets the requirements of the modern electrified network and Network Rail standard NR/L2/ ELP/27229 issue 2 – Specification for Remote Control Equipment.

The design encompasses proven applications and consists of a Mitsubishi Electric Q Series PLC, Tracklink interface cards and a panel- mounted HMI (human-machine interface) from Mitsubishi Electric’s GOT 2000 range. All the necessary telecommunications equipment, intelligent device interfaces and battery-backed power supplies are included.

Acting as a slave system to the master control SCADA from which it receives instructions, the Tracklink RTU issues switching commands to the substation equipment and then relays back the plant status as single-bit alarms. Where required, analogue readings can be taken from transducer equipment and relayed to the SCADA to provide voltage and current levels.

Intelligence and control

The Mitsubishi Electric Q Series PLC provides the Tracklink RTU with its intelligence and control. The core PLC build consists of a central processor unit (CPU) together with communications and input/output modules. These modules are fitted to a high-speed backplane to enable fast data transfer between the CPU, I/O and communications modules, and the central SCADA.

The CPU programming was developed using standard function blocks and has been created for the supply of small, medium and large applications. This enables simple mapping of the I/O for each system once the design has been agreed.

A range of communications modules is available to provide a number of options when connecting to the SCADA and other substation devices. These consist of both serial and IP-based solutions that conform to recognised standards for substation automation systems. The Tracklink RTU has been pre-configured to use legacy system protocols as well as DNP3 (Serial /IP), IEC 60870-5- (101/103/104) and IEC 61850.

Intelligent interfaces

A key component in today’s modern substation designs is the role of the IEC 61850 communications standard. Integrating substation devices such
as RTUs, protection relays, circuit breakers and other intelligent electrical devices (IEDs) onto one common IP-based bus network provides a cost- effective solution with a high degree of component interoperability.

Mitsubishi Electric’s C-CPU module can function as both a DNV KEMA- certified IEC 61850 client and IEC 61850 server, utilising both GOOSE and MMS messaging.

The C-CPU module, acting as an IEC 61850 client, will run the application to interrogate the IEDs and relay this information via a DNP3/IP protocol to the SCADA. It is a standard PLC module and can be fitted to the PLC backplane at any time, allowing existing Tracklink RTU installations to be enhanced at a later stage.

RTU key features

The Tracklink RTU solution has been designed not only to deliver the required functionality, but also to implement the following key features and benefits:
» Scalable I/O configurations
» Dummy and mass trip CB options » Distributed I/O applications
» COTS-based technologies
» Dual-processor option
» Reduced installation costs
» Future-proof design
» Interchangeable modules to reduce downtime
» Flexible enclosure design
» Reduced spares holding
» Reduced maintenance costs
» Master-slave architecture
» Multiple protocol implementation (legacy serial, IEC 61850, 60870 and DNP3)
» Battery back-up.

Plant interface and marshalling

To aid in the installation of the Tracklink RTU into new or existing substation installations, dedicated interface cards provide an industry- recognised configuration and point of demarcation. These allow the RTU to be installed using existing plant wiring while delivering the 5kV isolation required to protect the PLC from the substation environment.

Three interface cards provide marshalling and protection for key modules in the system. The Tracklink 10000 card, for the PLC digital input module, comes supplied with 32 individual isolated channels. Each marshalling terminal is fitted with an isolating link and LED for active indication.

The 10001 CO interface card is supplied with 16 relay outputs and 16 individual input channels and works with the PLC digital output module and its corresponding digital input module. Once again, each marshalling terminal is fitted with an isolating link and LED for active indication and the unit is designed for control circuit breakers (CB) and incorporates mass- trip and dummy CB configurations.

Designed for the PLC analogue module, the Tracklink 10002 AI interface card is supplied with 16 individually isolated input channels.

Local-control HMI

The panel-mounted Mitsubishi HMI can be configured to provide a range of features to aid operation, commissioning and maintenance. Standard configurations are supplied with an initial display mode of operation that facilitates instant access to the current status of the plant, including:

» Single line diagram
» Plant status alarms
» Analogue values
» Product documentation and isolation plant drawings
» Control of plant
»  Instantaneous trending of data
»  Historic trending of data
»  Plant statistics and alarm frequencies
»  RTU diagnostics.First year of operation

Commenting on the success of the new unit, and the developing relationship with Mitsubishi Electric UK, Hima-Sella business development manager Chris Elliott said: “The introduction of the Tracklink RTU to the market has been well received. We’ve had a number of units in operation on legacy systems across the routes for nearly 12 months. Achieving Network Rail product acceptance was critical and the support and commitment of Mitsubishi Electric and its technical team to this development was essential.”

David Bean, rail industry sales manager at Mitsubishi Electric UK, added “The combination of Mitsubishi Electric’s proven technologies, offered in a commercial off-the-shelf product with Hima- Sella’s expertise in both safety systems and traction power applications, has resulted in the development of the Tracklink RTU, which is a uniquely flexible, scalable, low-cost solution for modern substation automation applications.”

Hima-Sella and Mitsubishi Electric are continuing to develop the Tracklink RTU application for the rail industry and its potential for use in other markets such as power and water. It is a welcome addition to Hima-Sella’s proven product range which includes Tracklink III for selective door opening applications, Tracklink SCADA, and its Tracklink P2P solution for the control of MOS, NSCD and CTS applications.

Powering forward

Gospel Oak-Barking was one of London’s forgotten railways, neglected and unreliable. Its trains were among the oldest on the network and were often lightly used as a consequence. Its unstaffed stations also made it a route to be avoided, given a choice.

The electrification of this line, as part of the £2 billion National Electrification Programme to electrify more than two thousand miles of Britain’s railway up to 2020, will see new Class 710 four-car electric trains, able to carry double the number of passengers and so relieving overcrowding, entering service in 2018. It is a complex undertaking, and involves extensive re-modelling of track and bridges to unlock vital space needed for new electrical infrastructure.

The electrification system adopted is a classic 25kV AC classic boosterless. RJ Power Group is working closely with Amey-Inabensa – the 50/50 joint venture which is delivering Network Rail’s electrification requirements in the Southern region.

This success comes just six months after RJ Power Group Limited restructured, adding a power networks contracting division to its business and undergoing a rebrand to reflect its greater offering and continuing drive to employ innovation on a range of projects to improve rail travel in London and the South of England.

RJ Power Group’s scope of electromechanical work on the Gospel Oak to Barking contract includes 25kV traction power supplies, ancillary equipment and LV power supplies, substation bonding and pre-commissioning of all HV and LV supplies. It also takes in the installation of 25kV cabling and terminations, busbar and jumper installations, earth connections and bonding, DNO power supplies and control wiring and connections.

Up to now, RJ Power Group has built up a trusted reputation for electrical engineering, working chiefly in 750V DC. This latest project for Network Rail and Amey-Inabensa sees the group working with 25kV AC for the first time. This project will raise RJ Power Group’s profile as a contractor with the expertise and resources to deliver works on a much larger scale, with a greater breadth of expertise and experience.

Collaboration on Crossrail

The largest railway project in the London area is, naturally, Crossrail. A number of contractors are working together to deliver one of the most significant infrastructure projects ever undertaken in the UK, with contracts totalling several billion pounds.

RJ Power Group secured a significant contract for signalling and power supplies (stages 3-7) as part of a £50 million scheme at Ilford Depot. The group is collaborating with VolkerFitzpatrick to create ten new sidings and a new building for train drivers and other rail staff.

The two organisations have worked together successfully before, collaborating to deliver a time-challenged major rail project at Three Bridges Depot – resulting in the VolkerWessels Group Platinum Award for Project of the Year.

Enabling works for Ilford Depot began in July as the team began work with VolkerFitzpatrick to complete electrical enabling works in preparation for the main improvement works. These included the installation of temporary LV supplies to depot support buildings, including the yard controller’s office and mess rooms, as well as cable pulling, installation, termination and testing.

The main works have now commenced with RJ Power Group supplying and installing the distribution substations with an interface to the DNO provider, including connecting the services from both substations to the distribution cubicles, the points heating cubicles, the PSP and two separate buildings to create power within the new sidings. Also part of the E&P works is the provision of the supply and installation of the 650V signalling power supplies to support the changes within the Depot.

Significant evolution

The restructure and rebrand of RJ Power Group in March 2016 was effectively the start of a new era for the company. Significant evolution has taken place over the course of the year, with a number of key appointments in the team.

The addition of operations manager Owen Marsh back in the summer has seen the development of a number of new strategic opportunities for the group, and new business development director Mike Wakeford has also been pivotal in allowing the group to pursue its ambitions for expansion.

Simon White was appointed in September as the Group’s new rail testing and commissioning manager, helping to further consolidate the company’s growth and success over recent months. The most recent addition to the rail team is Andy Gore, who is the new senior construction manager.

With the successful implementation of a graduate programme to secure a skilled workforce for the future, RJ Power Group is gradually fulfilling its aim to be Network Rail’s contractor of choice for power and electrification projects in the south of the UK. However, as managing director Glenn Rowatt explains, the company’s ambitions don’t end there: “This year has seen RJ Power Group move into new spheres of work with great success, and our workforce continues to grow to meet our expanding schedule. The current project on the Gospel Oak to Barking line illustrates how we are diversifying.

Of course, we will continue with our core provision of traction power works. But as a company, we are now a proven quantity in 25kV, fully skilled and resourced to work with Network Rail in delivering its plans to electrify lines across London and the South East. The result will be a faster, cleaner, more efficient rail network capable of carrying far greater numbers of passengers in comfort. We are proud to be part of this.”

15 years in the making

Some of the most significant rail infrastructure projects in the UK’s history are in progress at the moment, and will set the course for the future of rail travel. Electrification is at the heart of many of the improvement programmes set out by Network Rail. Ultimately, the aim is to make our railways faster, more efficient and greener, increasing capacity and easing overcrowding for travellers.

A great many contracting companies are involved in projects across the country, bringing their expertise to bear on civil engineering, signalling, telecoms and OLE. Global Rail Construction Ltd (GRCL) – part of the Global Infrastructure Group – is one such company, involved simultaneously on a number of initiatives.

GRCL has a multi-disciplinary design and build focus, providing civil engineering, building, signalling, mechanical and electrical solutions on both heavy and light rail systems.

The common thread in all its projects is its people. GRCL has the resources to consistently deliver to – and go beyond – the expectations of clients.

Crossrail

Crossrail is billed as one of the most significant infrastructure projects ever undertaken in the UK and will provide easier, quicker and more direct travel opportunities across London, easing congestion.

GRCL was commissioned as principal contractor on behalf of Network Rail, to design and build four cantilever gantries, two portal gantry signal structures and two signals on existing OLE structures. Four are non-man accessible and two are traditional accessible structures.

As part of the design, GRCL’s in house design team produced full 3D designs for each structure. These were produced in a collaborative way, fully integrated with various other contractors working on the project using the ProjectWise sharing platform, with all drawings requiring conformity to the Crossrail CAD standards.

The project is currently on programme and has been completed to date, to the highest standards, with no incidents or accidents. GRCL’s works are scheduled for completion in December 2016.

Barnt Green to Bromsgrove Electrification

The Network Rail West Midland & Chilterns Route Utilisation Strategy (RUS), published by Network Rail in May 2011, identified the need to develop options to accommodate the current and future passenger demand between Birmingham New Street and Bromsgrove. The RUS also identified a need to address freight growth, particularly between the South West and Birmingham.

One element of the passenger service enhancement strategy to achieve this objective is to provide electrification and re-signalling of the line between Barnt Green and Bromsgrove, thereby enabling extension of the current electric Cross City services from Longbridge.

The project will see the electrification of approximately 4.5 miles of the route between Barnt Green Station and Bromsgrove Station. The system to be installed is a 25kV booster-less classic. The system will be constructed to be ATF ready, with increased structure lengths and spare capacity within the distribution sites to be considered.

The initial scope – which forms part of the Midland main line electrification works – will see GRCL as a planning and delivery partner to the ABC Alliance, delivering extensive civil engineering works to the station infrastructure, including extensive remedial works to the platforms and bringing them back into full service.

When the full scope of works are complete, the project will see the design, installation and commissioning of approximately 14 single track kilometres of new electrification between Barnt Green Station and Bromsgrove Station on the route section on ELR’s BAG2, with modification and integration with existing infrastructure on ELR BEA. Within the project’s limits is the Lickey Incline, which has an average 1:37 gradient for two miles. The steepness of this gradient will present greater design and construction challenges.

GWEP (Great Western Electrification Project)

GRCL’s part in the electrification of the Great Western Railway is to enable a sustainable mode of transport by developing a multi-skilled collaborative organisation in which people can succeed by working together.

This involves the construction of a number of substations on behalf of UK Power Network Services, for AST outdoor switchgear including, but not limited to, concrete bases, trough routes, compound fences, URXs, UTXs and cable bridges.

The aims of the project are to:

  • Deliver the scope of work efficiently and safely;
  • Achieve zero harm to staff, others and the environment;
  • Ensure the continued safe operation of the Network Rail infrastructure with a minimum effect on current performance levels;
  • Minimise environmental impact of the work during construction;
  • Promote sustainable construction through efficient use of resources and promotion ofenvironmental best practice.

Royal Wootton Bassett ATFS – this was a challenging site from the beginning and the site team encountered various problems, such as major design changes and unforeseen ground conditions (high water table) which hindered the progress from the start. However, leveraging good relations with both Network Rail and UK Power Network Services, the GRCL team managed to complete this ATFS site to a high quality standard, on time and within budget.

Little Somerford ATS – Works again on the site have been especially challenging, encountering unforeseen ground conditions, such as the old Somerford station platform, which had to be broken out and disposed of before continuing with the main construction works. All works have generally gone well with no major incidents and finished to a high standard.

Continuing the high standard and winning more tenders, GRCL is currently heading into South Wales and current planning along with the project setups for the next sites is underway, for Severn Tunnel, Cardiff Canton and Maindee. These sites are due for completion in October 2017.

East Notts Resignalling

As the East Notts project now enters the critical advanced level crossing phase, all emphasis is on achieving and completing as many of the construction works as possible on a modular basis to ensure the major commissioning phase runs smoothly and to plan.

July and August saw the successful delivery and installation of seven Si-REBs (signalling island re-locatable equipment building) with the final Si-REB installed at Newark Castle.

As the countdown to commissioning begins, GRCL’s civils team is on schedule, collaborating closely with their client ATUK, with all works being completed to programme. The seven level crossings are being commissioned over three stages, with stage one having been successfully delivered and commissioned on 17 September at Lowdham and Bleasby and stage three on 7 November 2016.

Celebration of success

The success of all of these UK major projects up to now is due to the extensive skills and experience of GRCL’s team of specialists – which have been developed and honed over 15 years.

2016 has been an exciting year in more ways than one. Both Global Rail Construction Ltd and its sister company in Ireland, Global Rail Services Ltd, have celebrated a 15-year anniversary. The former has received full PC status and the latter has recently been awarded with a significant light rail scheme in Dublin on the Luas Lines.

There has also been a significant re-branding to encompass the wider rail, infrastructure and telecommunications activities in Australia and Ireland, with the formation of the Global Infrastructure Group – bringing the companies together under one consistent banner and the Global family closer together.

Established by Marco Lombardelli and Ivan Holloway, it has grown into a successful group of multi-disciplined rail engineering and construction delivery organisations. The informal group of companies consists of the UK-based Global Rail Construction Ltd, Irish-based Global Rail Services Ltd, Australian-based Global Rail Australia Ltd and GRA Networks – a specialist telecoms subsidiary operating in both Ireland and Australia.

With 15 years of operation on multi-national rail networks, the Global Infrastructure Group of companies has over 500 years of infrastructure experience amongst its staff. The recent rebrand of the company was a signal of its intention to capitalise on its multi-disciplinary expertise and global reach.

Marco Lombardelli is quick to point to the quality and loyalty of his workforce as the reason for the success to date: “Our incredible journey over the past 15 years has been made possible by the team of specialists we have assembled in the three countries in which we operate – we are so much stronger by the sum of all our parts. Empowering our people and respecting everyone’s views form the basis of our core values.

“Heartfelt thanks go to each and every member of our team. We can now look forward to the next 15 years with great confidence in our delivery capabilities.”

Electrification in the digital age

Electrification has received some negative press coverage over recent times, with delays to major projects and significant cost overruns being widely reported. Why should this be and what has gone wrong?

Part of the problem is that there has been a significant gap between the last major project – East Coast in the late 1980s – and authorisation of the more recent schemes such as the electrification of the Midland main line, North West, and Great Western main line, the latter only recently scaled back yet again following demands from the National Audit Office. In that time, many of the people with electrification skills had either retired or moved elsewhere, and a dearth of knowledge has been a major factor in getting these projects progressed.

However even if that were not the case, the planning and design methodology, as developed in the 1960s through to the 1980s, is out of date. It relied on manual surveys, paper records and slow agreement between affected disciplines to get the necessary sign off, along with a restructuring of the railway and more complex contractual relationships post- privatisation. These processes have been part of the problem and are not commensurate with the digital railway initiative.

So what can be done to improve this state of affairs? Rail Engineer met with the Atkins electrification team to learn of the work that has been carried out to develop new design and planning tools. In the context of this article, electrification relates to overhead line 25/50kV systems, although it is perfectly possible that some of the design features could benefit any further expansion of the 750V DC third-rail network.

The basic requirements

To outsiders, planning a line to be electrified is a relatively simple process. You work to a set of standards to decide the type of electrification required. Survey the route and mark where structures and gantries need to be, order the materials, arrange a contractor, obtain the necessary possessions, carry out the installation, do some power up tests, run some test trains and hand over as commissioned. Unfortunately the real world is not like that and many other factors have to be taken into account before any real work can begin.

Firstly, it must be understood that electrification involves many engineering disciplines, the main one of course being OLE itself, which includes skills associated with mechanical, electrical, civil, structural and geotechnical engineering. Others include general civils for embankments, retaining walls and bridges, permanent way for line speed and track alignments, signalling for signal sighting and interference, telecommunications for immunisation requirements, traction and rolling stock for types of train and associated characteristics, operations for train planning and service frequency.

All in all, it is a very complex matrix, and one where innumerable consultations have to take place to satisfy the concerns and requirements of everyone.

The traditional sequence of events to create a plan for an electrification project is:
» Produce a layout plan following route surveys; » Validate the layout plan with all concerned;
» Undertake an interdisciplinary design check and an interdisciplinary review;
» Carry out a structural analysis and produce foundation designs
» Do a detailed cross-section design for every individual structure and produce a materials allocation;
» Carry out dropper calculations for the catenary wire;
» Produce a construction submission.

All these steps require separate documentation that then has to go through interactive consultation, which is a time consuming exercise. What if all this could be captured and logged on to a single information source that could then be shared by all interested parties and thus form an ongoing electrification plan to be used as a database for the totality of the project?

Electrification engineers within Atkins have been working on such a solution since 2011. They have built on learnings from the Innovate UK-funded Digitally Enabling Electrification project, which saw Atkins work with partners Laing O’Rourke, DHP11 and Imperial College to research and develop digital solutions to enhance productivity throughout the electrification lifecycle.

The resulting design solution represents the next stage in this thinking and has been deployed to deliver ever-increasing functionality to both railway infrastructure providers and electrification contractors over the last five years. A brief preview of this was given in the June 2016 issue of Rail Engineer and is now described in greater detail.

TADPOLE

Every good innovation deserves a catchy acronym, this being Tools Aiding the Design and Production of Overhead Line Equipment – TADPOLE. Designed by engineers for engineers, the concept to combine all the individual elements of an overhead line electrification scheme and produce a common set of data is an admirable one.

Together with software company DHP11 and using the skills of engineers who will eventually use the tool, an XML (Extendable Markup Language) file is built up as the project moves through the design life cycle. This enables high levels of integrity of data, reliability of design and responsiveness to evolving design requirements. It removes a lot of duplicated data activity, while allowing extracts of the data to be taken off and used by the various parties when it is needed.

The whole electrification design can be seen as a single asset base. Incorporated in this is the capture of all the technologies, (including existing asset information where it exists), which means a complete data set for the project can be created. The data set can be used to produce a very reliable picture of all the proposed installations and additionally include all the associated information for each structure, so as to compile a total visualisation of the route that is to be electrified.

The data can then be interpreted to build 3D models, undertake engineering calculations, order materials or do whatever is required at the relevant stages of the project. As each element of the planning work is completed, so the data set is updated to reflect what has been decided, which everyone can then see. The final version before the main construction work begins is used to complete the materials list and procurement specification.

Another significant advantage of this technology is that the need to disrupt the live railway for the installation of OLE is significantly reduced.

Information contained

Much of what an electrification scheme is made up of is obvious, but it is surprising to learn just how much information is required. For a start, every overhead structure or gantry is different even though they are all made up of standard parts.

Data required for every installation includes: foundation type, foundation depth, distance from running line, relationship to other lines, catering for switches and crossings, whether on level ground or an embankment or in a cutting, whether to be fixed to a retaining wall and how high that wall will be, how to locate on bridges / viaducts, proximity to any obstruction such as cable route or drain, existence of level crossings, expected wind loading, even the basic single mast, portal, cantilever, headspan decision.

Add to this the standard requirements for feeder stations, track sectioning cabins, autotransformer feeders and neutral sections, then one begins to see what a complicated exercise this can be.

Once the main decisions have been taken, it is usual to undertake trial borings to confirm the ground conditions. An increasing requirement in the design process is to plan the electrification for optimised possession opportunities required for track and overhead line maintenance. An example would be on a four-track railway whereas in the past, a single portal might be across all four lines, this now may change to have two twin-track cantilevers, thus enabling two lines to be closed with two remaining open for traffic. The use of standard parts sounds good but, with all the permutations, these number well over 1,000.

With each data set comes all the relevant information so that each structure can be viewed as a complete entity. The use of BIM (Building Information Management) techniques enables the sharing of data between disciplines and design stages. The resultant design is agnostic to any one supplier so as to allow many suppliers to bid for the construction contracts.

Usage to date

All this sounds great in theory, but does it work out in practice? The Atkins design philosophy has been tried out on part of the GW project working in conjunction with Amey as the prime contractor, on the NW electrification working with Carillion on the Manchester Victoria to Stalybridge and Bolton sections, with VolkerRail for Blackpool to Preston, also for pre-work on the MML scheme and will be used now that the project has re-started.

It is still being assessed for practicability and how best to ensure the effective distribution and updating of information as the work progresses. Essentially, TADPOLE is a GRIP 3-5 tool but capable of extending up the GRIP (Governance of Railway Investment Projects) ladder as design transforms into reality.

The design element is not linked to any particular method of contractor or supplier. Sometimes Network Rail chooses to manage projects with its own internal expertise, on other occasions it might elect to appoint a turnkey contractor with responsibility for the entire project. The aim of TADPOLE is for it to work with any combination of supply choices. Although Atkins owns the design tool, it does not own the input and output data contained, this being freely available to all.

Resourcing the project

The dearth of electrification projects during the late BR period has been mentioned. Supporting the ongoing development of resources is important if the predicted ongoing electrification programme is to enjoy better success.

Atkins has recruited many graduates and young engineers to bolster the discipline and TADPOLE is making it easy to understand and engage with the engineering. It removes much of the manual work and reduces the chance of error, yet remains driven by engineering principles.

To date, Atkins has 60 UK-based people in its OLE team, including 15 apprentices, as well as 22 engineers based in India and 40 in Scandinavia. Clearly, TADPOLE is a tool that is not confined to the UK and will be employed on overseas contracts when appropriate.

Ongoing development

At present, the tool is geared around office- based design activity, but with the data available it has potential for much greater application.

An industry body has been established to explore the next steps for digitising electrification – the Railway Electrification Delivery Group (REDG), which comprises the Data Exchange Working Group. Atkins has a role in the first and chairs the second with the whole thrust being to share knowledge and expertise.

TADPOLE can enable further efficiencies by allowing digital information to be used by frontline staff out on the ground carrying out installation
or maintenance work. Transporting the data on to iPad, tablet or other portable smart devices is an obvious next step, but this will require a discipline to keep the data up-to-date and for a routine to be in place that all parties follow so that accuracy and consistency is maintained.

The installation of structures, droppers and overhead wiring has been made more efficient by the advent of the High Output Plant System (HOPS) electrification construction train, but it is still largely a human-controlled movement.

Is it just possible to load the design and route data into the train so that it stops automatically at the right place where drilling or erection is to take place? Maybe a step too far at the present time but, with digital technology, all things seem to become possible.

This design initiative is very much part of the Digital Railway programme, although it is not high profile. Once success is assured and usage becomes commonplace, then it will take its place alongside ERTMS, TMS and the other elements of this step change in railway technology.

Thanks to Ben Dunlop, Paul Rowlands and Francesca Buckley from Atkins for explaining the TADPOLE service.

Written by Clive Kessell

Bennerley’s new dawn

Photo: Paul Atherley.

When King Coal ruled Nottinghamshire and Derbyshire, his monopoly transport servant for much of the nineteenth century was the Midland Railway. But only one party profits from a monopoly and the Midland’s ability to dictate prices on a ‘take it or leave it’ basis seriously dented Derby’s position as an industrial powerhouse. So when local businessmen set their sights on 4,000 acres of coal-producing land on the Duke of St Albans’ Bestwood estate – which hadn’t been worked for want of a rail link – they saw an opportunity to open up the market.

The Great Northern Railway (Derbyshire and Staffordshire) Act of 1872 paved the way for a 40-mile network of main line and branches, ushering in a new era of competition. But it came at a price, beyond the estimated £1.1 million construction cost. To entice the GNR onto the scene, it was effectively given free rein to adopt the cheapest possible alignment, demolishing its way through the middle of Derby. Several streets disappeared. That’s not to say the route was easy though: 23⁄4 million cubic yards of material had to be excavated as progress was made across the East Midlands, sufficient to form a pyramid with a base of five acres and reaching skywards by 1,000 feet.

Two big-ticket features focussed the minds of Richard Johnson, the Great Northern’s chief engineer, and Samuel Abbott, under whose immediate supervision the works were pushed forward by contractor Benton & Woodiwiss. The first, a tunnel of 1,132 yards, helped the line to negotiate a ridge to the north-east of Nottingham, whilst the second carried it over the River Erewash and its flood plain. This was Bennerley (née Ilkeston) Viaduct, a striking wrought iron structure, 484 yards long and 56 feet high. It’s one of only two surviving in the UK – the other being at Meldon in Devon – and was reputedly modelled on the impressive Busseau-sur-Creuse Viaduct in central France, engineered by Wilhelm Nördling.

Keep it light

The main part of Bennerley Viaduct features 16 spans, mostly extending for 77 feet and each formed of three lattice girders, supported by trestle piers. To overcome the Midland Railway’s Erewash Valley line, additional spans of 26, 35 and 52 feet were needed at its western end, supported by brick piers and abutments set at a skew of 15°.

Influencing the design and choice of material were abandoned coal and ironstone workings underlying the structure, the records for which were either lost or unavailable. A traditional masonry viaduct – or even masonry piers – was ruled out as it was assumed the honeycombed formations would be unable to withstand such a weight. As well as being light, the use of wrought iron also ensured a degree of flexibility in the event of foundation settlement.

“Personally, I think the proximity of iron producers was also a factor,” asserts Dave Gent, principal engineer at Atkins and wrought iron specialist. “Transporting materials to site was therefore not as expensive as it might have been. And what better way to showcase the capability of local industries?”

With its 39 puddling furnaces, Derby-based Eastwood, Swingler & Co won the contract to prefabricate the ironwork at its base on Osmaston Road. Construction got underway on the concrete and brick foundations in May 1876; two months later, attention turned to the first pier. Like the others, this comprised 12 tubular columns, riveted together from four quadrants and then cross-braced using interlaced pin-jointed ties to resist buckling and bending strains. Rather than using holding- down bolts, their bases were only held in position by building the brickwork up around them.

Whilst support for the rails would conventionally have been provided by waybeams, transverse iron troughs were instead installed at 2’4” centres, allowing ballast to the tipped across the deck and the track laid upon it. This low-fixity approach meant that any settlement of the structure – and consequential track misalignment – could easily be rectified through repacking. As the troughs also acted as cross girders, the load on the foundations was further reduced, totalling just 12 cwt per square foot.

Much like a production line, the process of erection gathered its own momentum, reaching a conclusion in just 18 months. But it was not without incident. A newspaper reporter recounted the scene after walking into the aftermath of a mishap involving a painter. “The poor fellow was adjusting a loose plank when he lost his balance and fell from a height of 40 feet head first upon the permanent way of the Midland Railway beneath.

He was said to have been alive when taken up, but as we listened to the description of the eye-witnesses and glanced, with a shudder, from the dizzy height to the pool of blood, which told its own dread tale too well, we felt that the chances of recovery from such a shock must be indeed small.”

Time travel

The viaduct started to repay the Great Northern’s considerable investment on 28 January 1878 when a limited minerals service started running over the Derbyshire Extension. Its operational life proved largely uneventful, except for the night of 31 January 1916 when a fleet of nine L20 Zeppelin airships crossed the North Sea with their sights set on Manchester and Liverpool. Several got lost in fog banks; others turned back due to mechanical problems. However it seems likely that the attention of Kapitänleutnant Franz Stabbert was caught by the glow of Bennerley Ironworks, immediately north of the viaduct. Several bombs were dropped, one narrowly missing the structure but obliterating the adjacent signal box.

Awash with duplicated lines, this corner of the East Midlands suffered deep cuts as the double- whammy of withering heavy industry and cheap road transport forced the notorious reshaping of the network in the 1960s. The Derbyshire Extension held out as a through route for freight until 6th May 1968, passenger services having ended four years earlier.

The viaduct enjoyed its retirement for a few years, earning a protective listing in 1974. A year later, however, with children risking life and limb on it, British Rail sought permission from two district councils to demolish the structure on safety and cost grounds. This was turned down, but its existence has been questioned periodically ever since, usually after adventurers have fallen off and injured themselves. Environment Secretary Michael Heseltine sent the matter to a public inquiry in 1980, thus creating some breathing space for the societies and campaign groups who wanted to save it. The outcome though was fudge and prevarication.

A charitable trust endeavoured to secure a useful future for the viaduct, but to no immediate avail and the British Rail Property Board eventually handed custodianship to Railway Paths Limited in 1998 as part of a portfolio which included 210 miles of disused railway routes and 695 structures. The intention was to ease the expansion of the National Cycle Network, under the auspices of sister charity Sustrans. It’s taken 18 years but, to that end, a way forward is now emerging for Bennerley Viaduct.

Power to transform

“Its time has come,” insists Kieran Lee, Sustrans’ community engagement officer. “Within the next few years, people will be crossing it again, but they’ll be on bikes.” Having lived nearby for almost 30 years, Kieran’s retirement has been largely consumed by the structure, promoting its future, helping others to learn more about it and leading monthly working parties of passionate people – the Friends of Bennerley Viaduct – who are keen to see the project come to fruition.

They see the viaduct as a community asset, with the potential to establish a direct, traffic- free route across the Erewash and serve as the centrepiece of an extended Great Northern Greenway, occupying the trackbed of the old Derbyshire Extension. It will connect visitors with the industrial legacy hereabouts and a fabulous wildlife corridor. Barn owls and kestrels both roost high in the viaduct’s ironwork.

“It has the potential to rejuvenate this part of the valley,” Kieran contends, “because people will come from a long way to see it. It will also give us pride that something on our doorstep is valued and celebrated. It’s not just ‘a lump of nineteenth-century scrap iron’, as a local councillor once described it. It’s a magnificent piece of railway architecture.”

Bringing all this about will not be cheap – around £2 million probably – but that’s small beer compared with the eye-watering £185 million earmarked for London’s Garden Bridge – crossing the Thames – £60 million of which is to come from the taxpayer. New earthworks will be needed as Bennerley Viaduct currently stands marooned, its approach embankments having long since been cleared away; there are also canals to overcome at both ends, as well as a bypass. Sustrans is expected to submit a bid for Heritage Lottery Fund money in February; the outcome should be known next summer.

Cover all angles

In part, the size of that bid will be influenced by the findings of a detailed condition survey – carried out during September and October – and the associated optioneering. This was very much a local effort, all those involved being based within 15 miles of the structure: Dave Gent leading on behalf of Atkins, with Bridgeway Consulting gathering the data. To help the engineering team, the Friends had already spent an arduous year ridding the pier bases of thick vegetation, as well as shifting ballast to expose the deck trough ends.

The work involved a laser scan of the entire structure, from which a set of accurate ‘general arrangement’ drawings has been produced. To reduce cost, time and risk, a tactile survey was undertaken of just one span by examiners using rope access, allowing the likelihood of defects in the other spans to be established through extrapolation.

Additionally, a full visual record was captured using an Unmanned Aerial Vehicle. “The quality of the high-definition photos from the drone is really promising,” says Dave Gent, “and is comparable with pictures taken by examiners hanging from a rope. You can measure bolt-head dimensions; rivets though are more difficult as they don’t have sharp edges. I’m hoping to use this as a case study to demonstrate the capabilities of UAV technology to other clients.”

In general terms, Bennerley Viaduct remains in remarkably good condition, despite the withdrawal of its substantive maintenance regime 48 years ago. Although the quality of wrought iron was inconsistent, the trapping of impurities through the manufacturing process had the effect of providing a higher corrosion resistance. This has worked to Bennerley’s benefit as its protective paintwork is now largely non-existent.

Whilst wrought iron could deliver a higher yield stress than mild steel, records weren’t usually kept of what grade of iron was used for which structure, so the loading capacity of two adjacent bridges – or even identical members on the same bridge – could vary considerably. There were no defined standards; section sizes were all determined by the fabricators and engineers.

As expected, the survey found that the trough ends have corroded and there’s some rust- jacking between plates. Rivets are missing – although there are almost half-a-million of them – and many of the pier bases have lost brickwork due to freeze/thaw action and sapling growth. Left to their own devices, these defects will inevitably deteriorate so some remedial work is needed. There’s nothing fundamental though.

Solid investment

As a piece of engineering heritage, Bennerley Viaduct has national importance. It is however legitimate to question how much value we can be justifiably attach to ‘heritage’ in this age of austerity. There are hospitals to fund, schools to maintain, and less public money to do either with.

The issue here is one of cost-benefit, looking at the broader picture. Ploughing money into a redundant structure is teetering on untenable, beyond the obligation to protect public safety. So why not restore its functionality? Bennerley can be repurposed to benefit health, transport, tourism, business. There’s more to life than CapEx; schemes like this impact positively on communities long after the compound has been demobilised. Evidence of that can be found up and down the country. Ultimately you get more out than you initially put in.

It’s hoped that Bennerley Viaduct’s next operational period will be underway by 2020. Get your lycra aired.

Written by Graeme Bickerdike

Inset photos: Four by Three

Rail Engineer Issue 146: December 2016

Control & Communications in the Gotthard Base Tunnel

Crossing the Alps in Central Europe has been a challenge for centuries and no more so than for the early railway pioneers. In 1882, after a 10 year construction, the first rail tunnel through the Saint Gotthard Massif opened, being 15km long and connecting Gőschenen with Airolo in Switzerland. It provided a route from Zurich through to Italy. Originally powered by steam traction, it was electrified in 1921 and has been a main route for nearly a century.

With increasing traffic levels and the need to eliminate the gradients to the tunnel approaches, the Swiss embarked on the building of a new deeper and longer tunnel. Alp Transit Gotthard (ATG), the company formed to construct this new Gotthard Base Tunnel, began work in 1999 – final break through happened in 2010.

Commencing with the boring of access shafts and construction of work site galleries to accommodate the boring machines, the tunnel consists of two single-track bores with two crossover points, at 1/3 and 2/3 distance, plus cross passages at 325 metre intervals to house electronic equipment cabinets. These also provide access for track workers and escape routes for passenger use in an emergency.

The maximum depth is 2.3km and temperatures would reach 46oC if forced ventilation were not provided.

The tunnel is 57km long (35.4 miles) and is the longest rail tunnel in the world. It connects the towns of Erstfeld in the north with Bodio in the south and shortens the route by 40km compared to the old tunnel, reducing the transit time from Zurich to Milan and Lugano by around 40 minutes. Electrified at 15kV 162/3 Hz, it will permit passenger trains to run at 250km/h and freight trains at between 100-120km/h.

Commissioned for trial running on 1 June 2016, the new tunnel will be in full commercial service by the end of this year.

A project of this size was never going to be cheap and expenditure of SFr12.8 billion (around US$9 billion) has been incurred. These figures are based on 1998 prices excluding inflation, value added tax and construction interest.

As stated above, construction has been the responsibility of ATG, a wholly owned subsidiary of SBB CFF FFS, the Swiss national railway company.

Signalling the tunnel

The Swiss, despite not being members of the EU, have been strong advocates of ERTMS and have led the way in the development of ETCS. Most lines are now equipped with ETCS Level 1 Limited Supervision (LS), which is a non-continuous train supervision system that protects the train should the driver not react correctly to the lineside signal.

Higher speed corridors, such as the Berne- Zurich and the Loetschberg Tunnel routes, are equipped with ETCS Level 2, giving continuous train supervision via the GSM-R radio link. It was a natural choice, therefore, that the new tunnel should be equipped with similar technology.

Whilst the application of ETCS Level 2 is now reasonably well established for conventional main lines with ‘normal’ tunnels, would the deployment of a system be different in a tunnel of this length? And should any special measures be made to ensure continuity of service?

ETCS Level 2 remains a fixed block system with the block sections being marked by ETCS marker boards. With its GSM-R radio bearer, there is no need for conventional line side signals providing all trains are fitted with the on-board equipment. After a competitive tendering process, Thales was selected to design and supply the ETCS system, including all the signalling peripherals, with a contract that was let in 2008 with a current value of SFr190 million.

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Designing the system

Many decisions had to be made before detailed design work could commence. Spacing of the block sections, and the relationship of these to the issue of Movement Authorities, needed to be determined so as to maximise the anticipated traffic flows. All of this was modelled on a simulation programme devised jointly by Thales and SBB engineers. The result was to have balises spaced at a typical distance of 800 metres inside the tunnel and between 200-400 metres on the approach tracks at each end. This gives an improved safety separation inside the tunnel.

ETCS marker boards (along with Swiss national rail boards) are provided at the balise locations. Movement Authorities can be granted up to a length of 32km but are limited to only a few block sections if trains are running in close headway. Normally freight trains will operate with a 5km separation, rising to 9km (about 10 block sections) for passenger trains owing to their higher speeds. Only one Radio Block Centre (RBC) is provided for the tunnel operation, this being housed at Bodio. Other RBCs are being installed for the whole Gotthard Base Line route and, indeed, for other rail routes in the surrounding area.

Four interlockings are required for the two crossover locations in the tunnel and for crossovers on the approach tracks. The interlockings provide the safety intelligence of the signalling system as well as the safe route setting. The RBC can only allow a Movement Authority if the interlocking has safely set and locked the necessary route.

Thales ELEKTRA 2 interlockings are installed in the equipment buildings at Erstfeld and Bodio. This electronic interlocking design has been in service for around 15 years and has a proven track record. It has full hardware redundancy and operates using two separate data channels, each separately programmed by two teams, from which comparisons are made before the final data configuration is agreed (diverse programming).

Element controllers are installed in the tunnel locations. Whilst train position data is transmitted every 6 seconds via the GSM-R link, independent position information is derived from axle counters, the Alcatel AzLM type being used. Thales absorbed the Alcatel rail signalling interests in 2007, so it was a natural choice. The axle counters are located adjacent to the balises but separated by a minimum distance of 1.2 metres, to avoid any unwanted mutual interference.

The two crossovers within the tunnel are equipped with Hydrostar point machines supplied by Linz-based Voestalpine, allowing a 110km/h turn out speed.

The entire tunnel is provided with a no-break power system based primarily on batteries and invertors and designed to be fully resilient. Similarly, the signalling transmission system is designed as a dual ring (red and green) fibre cable using SDH transmission to give continuous connection and guard against both equipment failure and cable cuts. Thales designed the fibre configuration, with the actual fibre rings being supplied by the Swiss company Alpiq, part of the Transtec consortium alongside Thales.

The operational control centre for the tunnel is located at Pollegio, near to the southern portal of the tunnel. The train control system there is a Siemens-supplied system that will eventually control the whole of the region.

Train fitment

Many trains in Switzerland are already equipped with either ETCS Level 1 LS or Level 2, as well as GSM-R radio. Only those fitted with an ETCS Level 2 capability are permitted to operate through the tunnel.

The ETCS train-borne equipment is supplied by either Alstom, Siemens or Bombardier, and all trains will be retro-fitted with Level 2 equipment.

A new fleet of 250km/h trains, to be supplied by Stadler Rail, will come fitted with Level 2 at the factory.

Since the tunnel is required to facilitate public mobile communications (see below), the trains have to be fitted with repeater equipment to enhance the signal within the carriages. This repeater is manufactured by Commscope, a global leader in infrastructure solutions for communications networks, which is supplying the ‘In Train Com’ company as part of a joint venture with the public mobile operators to work with SBB and the train build companies.

Telecommunications

A tunnel of this importance inevitably has a comprehensive telecom network supporting both rail operations and public requirements. The fully resilient fibre optic cable network was supplied as part of the power provision contract of the tunnel construction consortium (TTG), which specified the cable parameters using various specialist companies to assist with the task.

Once installed, the provision of the associated transmission was entrusted to Nokia as the system integrator using IP/MPLS Multiprotocol Label Switching telecommunications technology. Nokia, also a member of the Transtec consortium, was already involved in supplying GSM-R equipment to SBB prior to the Gotthard Tunnel project so was well known to the client.

Photo: SBB.
Photo: SBB.

Telecom requirements come in three parts. The fixed line, data and servers networks using multi service Ethernet over IP/MPLS technology, support the tunnel communication requirements. These include IP phones, emergency call points, video surveillance and a public access system including loudspeakers. The latter led to a problem with reverberations in the long thin ‘tubes’ in the two multifunction stations Sedrun and Faido – only overcome by adhering sound absorbing material to the tunnel wall.

Connections of the 19 sub-control systems to the SCADA-based tunnel control systems provide for alarm gathering, network management, power supervision remote monitoring and many others. During simulations, it became evident that there would be over 150,000 datapoints with sensors even being able to trace loose connections. Every door, light and air vent is supervised from the control centres in Erstfeld and Pollegio. The comprehensive system is designed to cope with all scenarios including emergency situations and was supplied by Siemens as a sub-contract to Nokia.

The tunnel radio system, based on radiating cable (leaky feeder) in both tunnels, has a length of 120km and is sectioned into 900-metre lengths. This is a backbone for all radio services with SBB doing the functional specification and Commscope providing much of the hardware as a subcontractor to Nokia.

The provision of public internet access is achieved by ATG/SBB in conjunction with the three Swiss mobile operators – SALT (pre Orange), Sunrise and Swiss Com. SBB is contracted to provide the infrastructure for the mobile operators who then provide the 3G and 4G services. These operate on the 900Mhz, 1.8GHz and 2.1 GHz bands.

GSM-R

The radio bearer for ETCS, GSM-R, is a vital part of the communications network. SBB took on the responsibility for the provision of GSM-R and achieved this with a contract awarded to Nokia.

The GSM-R radio system is borne upon the same radiating cable as that which carries the public cellular services. The system is split into 900-metre sections, meaning that 32 base stations (BTS) are needed.

The initial design was built and configured in an SBB test laboratory with two base station controllers and three BTS. This tested out the dual redundancy arrangements and the handover scenarios in simulated tunnel conditions as well as the Radio Block Centre connection and the functionality for ETCS.

With both Nokia and SBB satisfied, installation commenced in the two tunnels with the system progressively commissioned ready for the opening in mid 2016.

Currently controlled over the SBB SDH (Synchronous Digital Hierarchy) transmission network, the GSM-R system will migrate to the IP data network also being provided by Nokia in due course.

The approximate value of the telecom element of the control and communications contract is less than 10 per cent of the whole railway technology delivery contract from Transtec Gotthard.

Degraded mode operation

Whilst the signalling and communications systems have been designed for maximum reliability and availability, there could always be the odd occasion when the systems fail.

With the near certainty of trains being in the tunnel should this happen, measures have to be in place to ensure train movements can still be made. This is known as Staff Responsible Mode whereby trains can be driven, not under the supervision of the RBC, at a maximum speed of 40kph.

In extreme conditions, trains are permitted to be driven ‘on sight’ even if the communication path is also failed.

Should the failure be a train breakdown, then operational procedures are prepared for a rescue locomotive to be signalled into the tunnel to assist the failed train.

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Safety verification and system testing

In 2010, the main system components were assembled in the Thales laboratory in Zurich so as to prove the integrity of the design.

Installation could then begin and, in 2013, field tests were commenced which included the GSM-R communication link. Thales, the tunnel construction consortium (TTG) and the client (ATG) were involved with this, later to be joined by SBB technical staff who performed their own separate tests as well.

As with all modern day safety requirements, a verification and validation exercise of the system was necessary, this being carried out by Thales. An assessment of the Safety Case requirements covering the four separate elements – RBC, Interlocking, Train Control and Whole System – was contracted to a specialist assessment company in Vienna.

Completing the route

The Gotthard Base Tunnel is not the only major upgrade on the new route from Switzerland into Italy. South of the Gotthard tunnel is the Monte Ceneri, another mountain crossed by an old high-level tunnel. The 15.4km twin-bore Ceneri Base Tunnel is currently under construction, with breakthrough being achieved in January 2016.

The control and communications systems are expected to be broadly similar to those in the Gotthard tunnel but the technology for this engineering of the project is being provided in four separate elements – track and logistics, electrification and telecommunications, the tunnel control system and signalling. Installation and fitting out has begun, with completion expected in December 2020.

The Ceneri Base Tunnel will run from Camorino to Vezio near Lugano and, like the Gotthard, it will shorten the route as well as allowing much longer and faster trains to operate, reducing the transit time by a further 20 minutes.

The renaissance of rail during the last 20 years has resulted in a number of major infrastructure projects to increase capacity and line speed. These have created new engineering challenges, including within the control and communications sector. The Gotthard Base Tunnel is within the ‘big league’ of these and, once the full service is introduced, many eyes will be watching to see if the technologies are able to deliver the predicted business improvements.

Written by Clive Kessell

Sir Peter Hendy on the future of Britain’s railways

When I was Transport Commissioner for London, we used to talk about what transport did for London. Not about transport itself, but what it did, how it created growth, jobs, and housing.

But, in the industry it’s very, very easy to talk about how it works and not what it does. The railway makes a huge contribution to the national economy and it’s been growing for the past 15 or 20 years, delivering growth and jobs and houses. The Government is now investing more in real terms than anybody has ever invested. That’s not a political statement, it’s a matter of fact, if you count it in real terms.

The railway has been growing by three or four per cent for 20 years. That’s the fastest level of growth since the Victorian era and it’s quite fantastic.

And it is a significant change. When I first started in my transport management career, which incidentally was more about buses than trains, I spent most of my time making people redundant. We were all managing a very different, very difficult business, trying to make do with less money and to keep the thing going.

Now, we’re in a different position, and that’s one of the reasons that I’m so optimistic now about attracting and retaining people in this industry, because there’s something positive to do which is essential for the national economy.

Congestion

As a result of the railway having retrenched so much since the 1950s, we’ve got the most congested railway in Western Europe. That’s not a problem, it’s a success. It’s good that we’ve got a congested railway, we’ve just got to fix it.

If I look out of my office window at Waterloo, I can see 100 million people a year using just that one station. Even the retail spaces in our stations are now fantastically valuable because they’re vibrant places, and that’s really good for the railway.

Why do so many people travel? They travel because they’re accessing work, and not just in London and the Southeast. The pressure in the Northern Powerhouse is tremendous because people know that the potential is there and they’d like to see more of it. In Scotland, Glasgow and Edinburgh they live off their railway systems for the same reason. There’s pressure in the Welsh Valleys, in the Midlands, and in Bristol – the railways are crowded.

To relieve all this pressure, routes such as Thameslink and at Crossrail, which are parts of the national railway network, are going to operate 24 trains an hour, which looks like the Tube. In fact, it’s higher frequency than much of the Tube was, certainly in the last 30 years, and actually, the trick of it is, it’s going to be run like the Tube.

PPM is the standard measurement of railways performance, but you don’t measure the Tube on PPM, you measure it on excess waiting time. So you should, because passengers don’t go for a particular train, they go because the service is frequent and they want a frequent and reliable service.

But the national railway network isn’t measured like that, and it doesn’t work like that yet, mainly because the signalling which has been used on the national railway network for nearly 200 years is really not suitable for the twenty-first century in which we’re living.

Digital implementation

The big railway has had a number of digital signalling projects, none of which have ever been completed. That has resulted in a patchwork quilt of everything from Victorian lever frames, through technology from the 60s, 70s and 80s, and 90s to the present decade, and none of them have ever quite been finished.

The Victorian stuff costs a lot to run, but it’s usually reliable and you only need a blacksmith and hammer to fix most of it. On the other hand, the equipment that’s 40 and 50 years old has to be replaced because the cables have been degrading. Obtaining parts for this old kit is difficult – we literally have to buy green screens and computer parts off Ebay. The signal engineers at Network Rail are doing their best to balance all of the replacement targets with the obsolescence that they’ve got and the life that’s left.

But actually, the real answer is not to replace them like for like at all. The real answer is to change the way in which we signal railways to allow more trains to run without improving large parts of the railway infrastructure.

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That policy does have some other implications. One of the effects of it is that some of the costs of the railway go up because we’re using it more, we’re using it for longer, so it wears out quicker. We have to repair it in a shorter space of time, we can’t send a couple of people out to repair things on the track during the working day so we’ve got to do it at night. The more we use the railway, the more it costs to keep it running.

I have nothing but praise and admiration for Mark Carne. More has happened in terms of major change in his tenure since February 2014 than most people have in their working lifetimes, but he has been an evangelist for digital rail.

What he discovered when I turned up was that I’d already run a railway which had digital signalling. If the growth continues, we should be seeking to expand the railway to fit the number of people that want to travel on it. The way of doing that is to get more trains on it, and that’s really all we did with the Underground.

The Victoria line is a good example. They knew that they could get 34 trains an hour. They might get 36, they might even get 38 out of it, which if they do would be fantastic, because that would be four trains more capacity per hour in peak hours, and the peak hours now last longer and longer and longer, and that would be a fantastically good investment.

But it is also extraordinarily reliable if you do it properly. On the Jubilee line, putting it in was hell, but that wasn’t because of the signalling system, it was because the PPP didn’t allow the correct relationship to deliver the project. But passengers on the Northern Line barely noticed – it was really done quite elegantly.

I know it’s different on the big railway. It doesn’t have homogenous trains and they don’t all stop at every station. There are also freight trains, and their acceleration is different, they take longer to brake, they run longer trains, all that sort of stuff, but the principles are the same. All we need to do is adapt the technology that we’ve already seen to do a similar job.

That’s one of the reasons that I’m really excited that David Waboso, who managed the Capital Projects Department on the Tube, has decided to join us. So now David can begin to assemble a programme in the knowledge that he’s done it before, he knows how to do it, he knows who the suppliers are and it’s all down to leadership.

Already, he’s told me that it’s not just an infrastructure project, it’s a whole industry project. It’s got to embrace the entire industry.

It has to embrace us of course, because we’re the custodians of the infrastructure. It has to embrace the DfT, because they’ve got specified franchises that take advantage of it. It has to embrace all the operating companies, both freight and passenger, it has to the embrace the rolling stock companies and the manufacturers.

David knows what it does, because he’s done it on the Victoria, Jubilee and Northern lines. It changes the way that the railways work, and it’s a project that he will deliver, over as short a period as possible, to benefit the whole country.

Who will pay?

The plan rightly ought to be related to benefits, so we should do it first where we can create the most benefit – growth, jobs and houses. That’s not just in London and the Southeast, it’s in other regions as well.

We should also do it in order to get revenue up – more trains will produce more revenue in terms of track access charges – because that will help pay for it. However, there will have to be some adjustment because the railway revenue goes in through a different door of the Treasury to the one which Network Rail costs are paid out of, which is not a problem we had at TFL, so that needs to be resolved.

There’s also a question about who might pay for all the upgrades. Actually, it’s not entirely clear whether the public purse will pay for them. One of the advantages in keeping on talking about growth, jobs and houses is because there are many beneficiaries of good transport, such as businesses which expand as a consequence of better access, and developers which are able to build houses that otherwise wouldn’t be economical. I can’t see any reason why you can’t harness that economic improvement to pay for some of the developments, particularly since it’s new technology.

You don’t particularly want to take a risk on 190-year-old infrastructure. But the digital railway will be a new project, and it will be largely train-based. The stuff that’s fitted to the physical railway will be new, and I think that there’s a very good case to actually look for third-party funding for it. That includes the supply industry, for whom this is a fantastic opportunity to do this first in Britain, even if they’re not British companies, and then extend the concept to other congested railways in the rest of the world. I think that’s a very, very bright future.

There are some constraints. Money is obviously one of them. Getting access to the railways to do this as well as everything else could also be a constraint, but I think it could be overcome.

The breadth of the supply industry to cope with this is also potentially a constraint. We don’t want this to be a 50-year programme, because it produces economic benefit almost immediately as there will be more trains. So we need to look at it as a much shorter programme, for which there’ll have to be more suppliers.

Skilled workforce

As a result of CP5, and looking into CP6, we’ve got a huge project portfolio of work in Network Rail alone, and it affects the whole supply chain.

We’ve got digital railway, we’ve got other new technologies coming in, we’re developing the means to look at what’s happening to railway assets, the earthworks and so on, before they fail.

The railway operations part of Network Rail also needs to develop more skills because the railway is getting more crowded.

And we’re decentralising, which we are doing for a very good reason. Without it, our approach is unbalanced and we won’t look after our customers in the way that we should.

For example, we’ve now got route score cards, which are the way in which our customers in train operating companies can agree with us on what we should be delivering. We need to build up the management in those routes. They’ve got to be ready to run themselves through an individual regulatory settlement with the ORR, under the umbrella of Network Rail, so that’s quite a different sort of organisation.

They’ll need to build up the engineering teams. They will need commercial teams to deal with the Western England Partnership, Midlands Connect and Transport for the North and so on. They will clearly need more financial muscle than if they were just a cost centre, and they will need some decent operating people as well.

So, even within Network Rail, there are huge opportunities, some that we can build internally and some we can build externally. There is, in any event, a skills agenda, not merely in Network Rail, but also in the rest of the railway industry, as we are all short of skills. We are moving from people going round with hammers and doing heavy things, to roles where technical skills are far more valued – skills and techniques which are far from ordinary manual labour.

The consequence within Network Rail is that we’re increasing apprenticeships as much as we can. We will move to at least 300 advanced apprenticeships and the thirst in the market for these places is incredible – we get thousands of applicants.

The Government is committed to it as well. There’s a rule of thumb, which is one apprenticeship for every £3-5 million turnover, and quite right too. It’s absolutely necessary because it gives the winners of medium to long- term contracts an obligation to train people, so they’ve got enough people to actually deliver it.

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Then there are university graduates. We’ve tripled our number in four years and we’re participating in the new concept of university technical colleges or UTCs. We supported one in TFL and there’s another one in Westminster that we’ve supported. And, it’s a massive, massive effort.

Positive message

We must have these people, and the rail industry has historically not been very attractive, because we haven’t explained what we do. The result is that we need to promote the diversity agenda by getting a much wider supply of people in than ever the railways have done before. We now have the Young Rail Professionals, who have a much more balanced agenda, come from a much wider range of ethnic backgrounds and can commit themselves to the job in the railway industry for a long time.

In the past, we haven’t explained ourselves quite in the way that we should. You don’t naturally open the papers and find that the railway is a growth industry, you open the papers and find there’s a strike on Southern. So we’ve got to work hard against that background, that miserable media coverage. But I think that, amongst the people who might join the railway, there’s a growing realisation that it’s a great place to go.

There are some great things happening in the press. In a recent Evening Standard, there was a fabulous picture of four women, three of whom I know, dressed up for Vogue. They’re dressed up because they’ve been working on Crossrail, and it was headlined ‘Hard Hats and High Heels’. These are not dull blokes in hard hats, these are members of a vibrant younger community who have chosen to work on a railway project because it’s exciting and because it teaches them new skills. That is exactly where we ought to be, so we’ve got to promote it.

For many of our people, this is not just a job, it’s a vocation. They talk about working on the railway because their employers have changed, but their commitment to the railway is absolutely total, and I think one of the things that young people and people at the start of their careers need to realise is that you not only need technical skill, but you need to understand the mind-set of people.

I can’t quite say that any particular employer in the rail industry will give you a job for life, because that’s too presumptive about organisational change, but what I can say is that, given the growth in the industry, if you want to work in the railway industry and if you’re prepared to change who you work for, where you work and what you do in the train industry, you have a job for life.

That’s extraordinary, because there aren’t many industries in Britain now where you can say that. This industry has a job for everybody if they’re prepared to change who they work for, what they do and where they do it, and I think that’s quite remarkable and I think that’s a cause for great optimism.

In an era of continuous change, it is that very change which nearly always frightens people in the industry. However, in my experience, change always creates more opportunities in the end, because you lose people on the way who don’t want to change. I can’t think of any change that I went through when there weren’t more management opportunities at the end than at the beginning.

So there’s a job for life in the industry for anybody who wants one if they’re prepared to change who they work for and where they work and what they do, and those changes actually produce opportunities at the end of it.

So I am optimistic about the future, and the opportunities it presents. But if you give me the choice of completely reorganising the railway over the next 10 years, or delivering a digital railway, I’d choose the digital railway because that will deliver more for paying customers.

Sir Peter Hendy was speaking to the Chartered Institute of Logistics and Transport and the Railway Engineers’ Forum.

Crossrail – approaching the final stages

As autumn approached, Crossrail announced that, following a very intense and busy period, the project had reached yet another milestone – declaring that 75 per cent of the work was now complete. To understand better just what “75 per cent complete” actually means for the engineers involved, Rail Engineer caught up with Chris Binns, chief engineer for the £14.8 billion project.

First, a recap on the project. Crossrail extends from Reading and Heathrow in the west to Abbey Wood and Shenfield in the east, a route that is 118km long. It includes a new central core consisting of 42km of new bored tunnels.

There are 40 stations on the route, including 10 new Crossrail stations that are entering their final stages of construction. Some are in very complex locations – Paddington, Bond Street, Whitechapel and Liverpool Street to mention a few. In addition, there are complex, redesigned track layouts both west and east of the capital.

Bombardier is currently building 66 new trains at its factory in Derby. Each train is 200 metres long and designed to carry 1,500 passengers. The first trains are now coming off the production lines for trials and testing, ready to be introduced to services on the route between Liverpool Street and Shenfield by May 2017. This deadline will be followed by further targets of May 2018 from Heathrow to Paddington then Paddington to Abbey Wood by December 2018.

Myriad of system interfaces

More than 35km of permanent track has been installed inside the new tunnels and the fitting out of the mechanical and electrical equipment for the stations, signalling systems and power supplies is now well underway.

Engineering teams are being refocussed and are slowly moving away from production issues toward the intricate requirements associated with the testing and commissioning regime. Not only do the myriad of system interfaces need to be tested in the new tunnels but also with the different Network Rail environments both east and west of the capital.

Chris was keen to point out that none of the fitting-out work of tunnels and stations can be carried out without the skill and support of a competent and innovative supply chain.

Back in April 2013, Crossrail awarded the last major suite of contracts, valued at £300 million, to a joint venture comprising Alstom Transport, Costain and French track work specialist, Travail Sud Ouest (TSO). Normally referred to as ATC JV, it is the joint venture’s responsibility to ensure that the tunnels are fitted out with the necessary equipment for an operational railway system.

When the tunnels were completed, the construction included a mass concrete base ready to receive the various track slab designs. The base has a raised curb either side, which can carry a specially built multi-purpose gantry. There are four gantries working on the project and each one has the capacity to carry and position 28 sleepers at a time ready to receive new continuously welded rail.

A total of 70,000 sleepers are being installed. These are manufactured in Nottingham by SBC Rail and then stockpiled in bales at the railhead depots at Plumstead Logistics Centre in south east London and Westbourne Park temporary railhead in West London. Both locations are being used throughout the contract for providing engineer trains and for storing materials and equipment. The Plumstead railhead is going to be the permanent infrastructure maintenance depot for Crossrail.

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British Steel is supplying more than 57km of heat- treated, wear-resistant rail. The steel blooms are produced in its Scunthorpe plant but the slight surprise is that these blooms are then transported to Tata’s Hayange mill in northern France to be rolled and finished. Apparently, that’s where the heat-treatment furnaces are.

Heavy and light track slab

Chris stated that about 64 per cent of the track required in the tunnels has been installed. This is not an easy calculation because there are five different types of track being used, including:

  • Standard slab track which forms 80 per cent of the track on the new railway – 70 per cent complete;
  • Direct fixed track using Australian Delkor two-holed baseplates to reduce dynamic stresses and installed throughout the Victorian Connaught Tunnel – 100 per cent complete;
  • High-attenuation sleepers, similar to standard slab track, used in a few areas where noise and vibration need to be kept to a minimum – 25 per cent complete; » Floating track slab light, used to reduce noise and vibration in the Soho area – 50 per cent complete.
  • Floating track slab heavy, with a high iron ore content which doubles the density of normal concrete, is being used in the most sensitive areas such as under the Barbican Centre – work just starting.

ATC JV also invested in a refurbished concreting train in August 2015. It is a 465-metre-long mobile underground concrete batching factory using dry materials. Chris explained that running and maintaining the concreting train is a 24-hour operation. Concrete pouring takes place during the night with restocking and maintenance carried out during the day.The train has piping running from the front of the train, like a giant insect proboscis, for about 300 metres. This means that the train does not have to run on freshly laid concrete the next day, thus allowing the concrete adequate time to gain strength.Based at the Plumstead rail depot, the train is being used for the construction of standard track slab with a peak production rate of 377 metres in a seven-hour shift.

Turning a train

One disadvantage to the train, that Chris pointed out, is that it is designed to European gauge. So, when needing to turn the train to go in a different direction, they couldn’t just run it round a triangle. Instead, they had to lift each of the 23 wagons on to a low loader, turn it around using the gantry crane in Plumstead rail depot and then put it back on the tracks. This process took three weeks to complete. Fortunately, it was something that had been planned for! A different, smaller concreting train, known as the Shuttle, was also brought into action in January 2016. Chris explained that the Shuttle is being used to construct the standard track slab in the tunnels from the Royal Oak Portal through to central London.

The Shuttle train uses batches of ready mixed fibre reinforced concrete so time becomes an even more critical factor in the process.

High welding standard

Long welded rail trains are being used to install the continuously welded rail which is being welded together using a Plasser & Theurer road-rail flash butt welding machine, acquired by the ATC joint venture. It is specially designed to produce welds to a consistently high standard in a tunnel environment.

As part of the tunnel fit-out, it has been estimated that more than 250,000 holes will need to be drilled to accommodate brackets for cabling, walkways and other equipment to support the operation of the railway. A state of the art drilling rig, owned by ATC JV and manufactured by Rowa Tunnelling Logistics in Switzerland, is now being used to drill the majority of the holes, thus minimising the need for manual drilling.

Once the track slab has been laid, the rig sits on the track and moves through the tunnels, drilling the holes in pre-determined locations.

The machine has a dust suppression system in place, helping to produce a clean and accurately drilled hole every time. The rig is configured to work in conjunction with real-time 3D laser surveys of the tunnel to ensure accuracy. To date, approximately 25 per cent of the holes required to fix walkways, cable troughs and other equipment have been drilled and it is proving to be an invaluable piece of equipment for all concerned.

Platform screen doors

More than 92 per cent of the platforms being built in the central section are completed and 93 per cent of the platform edge screen fixings that will incorporate the platform screen doors, passenger information screens and advertising space are in place. The first prototype of the platform screen doors has been manufactured at Knorr-Bremse’s workshops in Melksham, Wiltshire.

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Three rail wagons, adapted from a shipping container design, are employed to install the door panels. Each wagon carries three panels, which are brought to the station platform along the tracks using a road/rail machine and then the units are just hydraulically slid into place. It is a very impressive engineering process.

A continuous band of lighting is incorporated into the top of the door panels so that the light is reflected off the curved fibreglass-reinforced concrete panels that form the cladding for the walls and roof of the station platforms. It looks good, and it is interesting to note that 96 per cent of Crossrail contracts have been placed with companies based in the UK, Knorr-Bremse in Wiltshire being one of them.

The Crossrail route will be powered by a 25kV overhead line system using a Cariboni 110mm deep rigid overhead conductor bar throughout the tunnels. Although from a different manufacturer, this design concept is similar to the one being installed in the Severn Tunnel that doesn’t require weights and pulleys.

In the central section, 25kV traction power for the Crossrail trains will be provided by two new bulk supply points from National Grid 400kV, at Pudding Mill Lane in the east and Kensal Green to the west. Super grid transformers have been installed and fitted with fans and additional coolants.

A 22kV high-voltage network will be installed in the central section from Royal Oak Portal in the west to Limmo Peninsula in the east with an 11kV high-voltage non-traction spur to be installed from Limmo through to Plumstead. This network will supply mains power to each Crossrail station, shaft and portal within the central section.

Copenhagen trial

When the new Elizabeth line opens, 24 trains per hour will operate in each direction through the centre of London. The new signalling system will incorporate Automatic Train Operation to support this service, with the capacity for higher frequency of 30 trains per hour in the future. As a consequence, Siemens is installing the Communications-Based Train Control system (CBTC). It is similar to one already successfully installed in Copenhagen, so expectations are high.

Chris was off to a meeting to review testing and commissioning plans and procedures. The emphasis is slowly changing from “how should we build it” to “how do we make sure it all works together?”

The teams are having to adapt to the new challenges of assurance but, clearly, the scale of these challenges will remain high. It appears to be a situation that Chris and his team are relishing, but the clock is ticking with just over 300 days to go before tests start in November 2017.

Midland Metro – an alliance for the long term

The Midland Metro Alliance came into effect on 4 July this year with the ambitious remit to expand the Midland Metro network still further. It is a partnership of nine organisations that aims to “transform the West Midlands by delivering the best integrated transport system for the future” and to contribute to both the social and economic regeneration across the region, delivering local jobs, upskilling and training.

The employees of all nine companies work together as one team. Even their business cards hint at this arrangement. Brightly coloured in magenta, with the logo and values clearly on the back, the front of the card has a cartoon showing three people looking at a drawing of the tram route. They work for different companies, but none of the company logos are visible.

They all work for the alliance, which is basically an agreement between three parties – the client (the West Midlands Combined Authority), the construction contractor (Colas Rail supported by partners Colas Ltd, Barhale, Thomas Vale and Auctus Management Group) and the designer (a consortium of Egis, Tony Gee and Pell Frischmann).

Why an alliance?

Phil Hewitt, Midland Metro programme director at Transport for West Midlands (TfWM), explained why the alliance concept was chosen: “The development of tram systems can be considered as high risk because, not only do they tend to have a very high public profile, there are also lots of unknowns when working on urban streets. For smaller schemes, the profitability can be relatively low and thus commercially unattractive under normal contractual arrangements.

“In addition, there is a danger of losing expertise on completion of smaller schemes, and therefore we felt that a move towards an approach that allows for a more strategic and continuous development of both skills and resources would be beneficial. This way, each scheme can build on the experience of the last so that there is always continuous improvement in techniques and performance.”

Building on lessons from past projects, the concept of the alliance is to ensure that all parties are incentivised to work together with the gains and losses shared between them.

Neil Farmer, executive director of alliance member Tony Gee and Partners, developed that theme: “With all these schemes either reaching delivery or in the planning stage, the original system is due to triple in size by 2026. Therefore, the decision was taken not to design the schemes as individual projects, but rather to take an holistic approach to system-wide design.”

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Another unique feature of the alliance is the commitment to innovation. Raising cash for research and development (R&D) is notoriously difficult – particularly in the public sector, but in the alliance, savings made will be ring-fenced to be used for this. By ring fencing some of the savings made by the teams it will be possible to develop better ways of delivering a world-class metro system.

While the office is staffed by individuals from the various partner companies, this is not immediately obvious. Staff are all encouraged and trained to see themselves as, first and foremost, working for the alliance rather than their own parent company.

Collaborative working is central, as is the development of a ‘no blame’ culture, but one where individuals are empowered to challenge the ways of working in order to find the ‘best for the alliance’ solution.

Planning for the future

Looking around Birmingham, it is clear that the Midland Metro is not the only show in town. The cranes are back and construction is booming. This is both a blessing and a challenge for the development of the Midland Metro.

A blessing, because it means that there really will be a need for an efficient transport system once the building works are complete, and a challenge since land will be at a premium, as will the availability of skilled staff. But if the alliance can plan strategically and train people to work on its system then, to some extent, it will have a more secure labour resource for the longer term.

And the alliance really is focusing on the longer term with a 2030 study. Midland Metro Alliance director Alejandro Moreno is keen to emphasize its value. He said: “It looks strategically at how the network will be operating in 2030 and beyond, as well as how it needs to be designed, looking especially at asset management and whole life cycle costs. The study doesn’t look at the details, but examines what needs to be done to ensure that the system will perform at its best for the city and across the West Midlands.”

Phil Hewitt agreed. “This will let us optimise the delivery strategy so that we can challenge those historic assumptions about how we do things and how long they should take. It is very exciting to have the opportunity to take this sort of long-term view – it’s a really exciting time to be here.”

So, over the next ten years, and maybe a little longer, there will be a marked transformation of the transport network in Birmingham.

Birmingham routes

At this point it is perhaps worth recapping on what has happened with the Midland Metro. The original system began operation in 1999. The 20.4km track, serving locations such as the Jewellery Quarter, West Bromwich, Wednesbury and Bilston, ran mainly along the former railway line between Birmingham Snow Hill and Wolverhampton, with a short section of on-street running along Bilston Road to the terminus at St. Georges in Wolverhampton.

Birmingham’s Midland Metro city centre extension was opened in May this year by Her Majesty the Queen, extending the tram service from Birmingham’s Snow Hill station to New Street station, bringing the tram right into the centre of the city along busy retail and commercial streets. This extension was part of a £128 million project that saw the purchase of a new 21-strong fleet of Urbos 3 trams, a refurbished depot at Wednesbury and new stops at Snow Hill, Bull St, Corporation St and Grand Central.

edgbaston-terminus

From the current terminus at Stevenson Street, right outside the entrance to Birmingham New Street station, there is a logical route along Pinfold Street, past the imposing Town Hall, to Centenary Square. That’s where some of Birmingham’s key attractions are located – the International Convention Centre, Symphony Hall and the Library of Birmingham with its walls made of hoops.

The extension to Centenary Square will provide 840 metres of twin track with trams designed to run on battery power, so avoiding the need for intrusive overhead line equipment in an area of architectural significance. The Urbos 3 trams were purchased originally with the option for battery traction so will be retro-fitted with the equipment ready for the new service which is due to start in 2019.

Funding has been earmarked to extend the route further along Broad Street, past Five Ways and on to Edgbaston by 2021.

To the east, there has been an application for a Transport and Works Act Order to build and operate the Birmingham Eastside extension from Bull Street to Digbeth, near to Birmingham Coach Station. Once granted, the order would allow work to start on the 1.7km extension which will serve the proposed HS2 station at Curzon Street, offering connections to New Street, Moor Street and Snow Hill train stations, as well as the bus services including the planned high speed Sprint service.

The route will fork at the junction of Bull Street and Corporation Street and run along Lower Bull Street past the southern edge of the proposed Martineau Galleries re-development to Albert Street.

It will then cross Moor Street Queensway towards Curzon Street and continue along New Canal Street before running into Meriden Street and turning left onto Digbeth High Street with a terminus between Digbeth Coach station and the Custard Factory – Birmingham’s ‘revolutionary entertainment, creative, digital and media quarter with office space, event venues, independent shopping and industrial space’.

Subject to any local public inquiry, work is scheduled to begin in 2019 and the line planned to open to the public in 2023. A number of new trams will come into use at the time that this extension is open to the public, to bolster the current fleet of 21 and provide a service running every six minutes.

The alliance is also working on the early phase of development of a scheme for the system to be extended past High Street, Deritend, via Birmingham City Football Club, Heartlands Hospital and Chelmsley Wood to Birmingham Airport/NEC/Birmingham International Station, with a new terminus at the HS2 Interchange Station in north Solihull. This will provide a key point of interchange for HS2 as well as massively improving accessibility to job opportunities for those living in this area.

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Outside Birmingham

In Wolverhampton, permission has just been granted by the Government to begin work on the £18 million city centre extension to both the train and bus stations, with completion scheduled for 2019.

Ensuring the benefits of Metro are shared across the West Midlands, a business case is being prepared to extend the Metro from Wednesbury to Brierley Hill which is an 11.5km route that runs largely along a disused rail corridor, deviating onto the highway to access Dudley town centre and Merry Hill with the terminus at Brierley Hill.

The increased capacity of the expanded network will require a new fleet of trams and a new depot to ensure that the infrastructure can operate efficiently. The control room will also require upgrade to enable it to be sufficient to manage multiple routes.

The capacity, resilience and reliability of power, systems and sub-systems will be reviewed to ensure that, when systems need to be renewed or upgraded due to being life expired or due to the requirements of an individual project, the longer term plans are taken into account. This will significantly improve the reliability of the network, and help the system to deliver one of the frequently stated priorities from customers.