In a world where railways are usually built, maintained, and operated under tightly controlled conditions, there exists a very different kind of railway engineering – one carried out in the extreme environment and danger of a military operation. When conflict or crisis strikes, trains still need to run, often carrying vital equipment, vehicles, and supplies towards the frontline. In the UK, that responsibility falls to a small but highly specialised group of reservists: 507 Specialist Team Royal Engineers (STRE), the British Army’s only dedicated railway engineering unit.
507 STRE is a nationally recruited reserve unit of the British Army that specialises in the repair and construction of railway infrastructure. It recruits staff nationwide from the national network, heritage railways, and from the construction industry, and is commanded by Major James Appleby, whose civilian role is as a regional engineer (building & civils) for Network Rail.
Hostile environments
Military railway engineering is very different to that most of us experience on the national network here in the UK, where almost every project is planned far ahead and carried out in a controlled environment. Military engineers operate in an austere and hostile environment, often at very short notice, using limited resources and materials to create adhoc and expedient solutions.
Their objective is to ensure the mobility and support the functionality of armed forces by maintaining strategic rail infrastructure to transport supplies and equipment forward to the frontline. They generally focus on the last 200 miles; behind that normal civilian resources would continue responsibility for maintaining their own network.
Railways remain a key option for moving bulk loads in times of conflict. The primary focus for military engineers is on temporary or hasty repairs, even if only to pass a single vital train across very poor track, at very low speed. Rapid solutions are essential, with upgrading or permanent solutions following later.
As part of NATO, the unit works with its counterparts in other armies to ensure interoperability and to understand other country’s infrastructure and track components.
507 STRE benefits from the very wide and unique mix of skills brought by its soldiers from their civilian roles. Its members bring their experience of UK railways, with track, signalling, bridging, electrification, and geotechnical skills included within the team. Its current strength is 46 soldiers against a full establishment of 55. It gives its members an opportunity to apply their engineering specialisms in challenging conditions, and the experience they gain and their military training can be used towards CPD and professional accreditations. Membership of the Institution of Royal Engineers is also available.
The unit has a key role in the armed forces, providing the only specialist railway engineering capacity within the British Army and would form the Army’s expeditionary railway warfare capability.
Unlike most Army Reserve units, 507 STRE’s soldiers have a liability of 19 days a year for training, with no weekly drill nights and a centralised training facility at Kineton in Warwickshire.
Its volunteers receive basic infantry skills and the specialist training required to deal with train derailments, repairing sabotage or bomb damage to rail infrastructure, constructing temporary bridging and demolition skills. They learn pragmatism, an understanding of short-term risk profiling and management, and temporary works skills.
While temporary bridging is primarily a combat engineer role, the unit has trialled bridge construction for rail traffic at its Kineton depot, using Mabey’s ‘Logistic Support Bridge’ components.
507 STRE holds the army’s derailment rerailing capability, with hydraulic jacks and other equipment. These reservists are also responsible for training regular soldiers as ‘Military Engineer Platelayers’. The unit also holds the last surviving Wickham Ford Cargo 1313/Matisa B.RRT2 Tamper as it’s mechanised tamping and alignment plant. The simple and light nature of the machine makes it easy to repair in combat environments and highly versatile in where it can be deployed by both rail and road.
Projects and exercises
The team delivers projects during weekend and annual two-week exercises, as well as in operational deployments. These not only enhance operational readiness but also strengthen collaboration and knowledge-sharing between regular and other national teams. Weekend exercises are generally UK based and aim to provide variety and operational challenges to the team. In recent years these have included laying plain line and pointwork; standard gauge at the A1 Steam Locomotive Trust’s depot at Darlington, and 3’ gauge at the Southwold Railway.
In April, 507 STRE was deployed to support 4 Light Brigade in Estonia and helped facilitate the onward movement of brigade vehicles to their training area, utilising a temporary Rail Point of Disembarkation – a mobile steel framed ramp built at a level crossing or at a temporary road/rail access point.
Over the last two years, the unit has worked in Germany, at Ayrshire barracks in Mönchengladbach, rehabilitating sidings and connections, including the use of polymer sleepers to replace timber – a first for the unit, with future environmental benefits. The construction plant used is mainly the Army’s wheeled and tracked excavators and loaders. Specialist road/ rail plant is sourced from Quattro Plant which supplied the unit’s exercises in Germany.
Most annual exercises are held in Europe, especially Germany, but during COVID, the team helped upgrade the Wensleydale Railway to improve rail access to the Redmire military railhead, used for transporting equipment to Catterick Garrison.
For the annual two-week exercise in 2025, 507 STRE led Exercise TURNOUT 25 to conduct training of NATO and other international troops, in ‘Military Engineering Platelaying’ activities. The exercise took place in Fort Polk, Louisiana, USA. The team consisted of over 100 personnel from the UK, US, Italy, Netherlands, Colombia, and Guatemala and provided a unique opportunity for a niche British Army Reservist knowledge base to upskill the knowledge and skills of multiple international partners. Operating in 32°C sub-tropical heat was a challenge, with monsoon-style rain adding extra discomfort.
The exercise included blast testing of railway infrastructure in collaboration with the US Army Engineer Research and Development Center. Forty-six metres of track was constructed including full construction from formation, using steel spikes on timber sleepers. This was used to provide damage training on rail infrastructure, via a controlled explosion. The subsequent re-construction of the damage gave a unique training opportunity to view the effects of a blast on rail and on the timescales to repair this.
The international team also built a 200-metre plate-laying training facility with the US 46th Engineer Battalion. The team led the upskilling of troops on rail construction and techniques and ensured that US troops now have the skills to complete further training and further construction of their facility themselves.
Discussions on differences in terminology and components highlighted the critical role of clear communication when working in multinational operations. Working with US rail components was a unique opportunity for 507 STRE. From understanding rail spikes instead of screws to adapting to differences in rail weight and tooling, this hands-on experience enhanced their skills and interoperability with NATO partners.
Transferable skills
The unit’s reservists bring a variety of skills into the team, but they also acquire military skills that can be taken back into their civilian roles. This is why employers are so supportive of reservists, recognising the benefits it brings to their own organisations. Indeed, Network Rail is very supportive of reservists, giving up to three weeks paid leave for annual training. It is also a strong supporter of the Military Covenant.
Captain Sophie Allinson works for Amazon as a systems manager managing teams and process improvement over nine sites. She has been a reservist for 10 years, commissioned in 2015. She began her army career with the Royal Monmouthshire Royal Engineers doing combat engineering for about five years. After a move to the northeast where there was no local Royal Monmouthshire unit, she decided to join this national team when a colleague pointed out 507 STRE to her.
Getting plant and equipment in place uses civilian skills, and Sophie has made use of her process, people, logistic and organisational skills, in planning exercises and training weekends. There is a wide range of skills in the unit and as one of its leaders she is able to draw on the right person to get the right information about a particular task or technology. This is a useful skill that has transferred back into her civilian role.
Sophie brings to the team her heritage railway experience on the Tanfield and the Pontypool and Blaenavon Railways where she is a fireman and is also involved in competence management. Most railway recruits will be familiar with flatbottom and higher speed trains, but in a war scenario the unit’s responsibility would be to fix damaged infrastructure to get trains moving. Her knowledge of bullhead track and slower speed trains adds to the unit’s experience and capability. Sophie was awarded ‘Reservist of the Year’ at the British Forces in Business awards 2025.
Amazon is very supportive of her involvement recognising the value of the skills she brings back. In common with most major employers, they are signatories to the Military Covenant.
Sgt Gavin Brown was a plant operator mechanic in the Royal Engineers, leaving in 2016. He joined Transport for London before becoming a Network Rail technician at Paddington and now a permanent way supervisor. He has been a member of 507 STRE for eight years. The unit had a low profile in the past including within the military, and Gavin was not aware of the unit during his regular service. It is now becoming much more visible, with publicity through articles like this and a strong social media presence. Gavin’s military role is very similar to his civilian role in leading teams in permanent way and other activities.
There are many digital and high-tech solutions available to teams on the national network, however not all of these might be available in an operational military environment. It is therefore essential that troops master first principal techniques to be able to construct in all environments and conditions. On a recent exercise Gavin led the teaching on the use of sighting boards in the reinstatement of track over a bomb crater. This involved a range of nationalities and teaching through interpreters. Technical terms proved difficult, especially as UK terminology is not universal.
Some European armies do not have a dedicated railway skilled team and Gavin has helped to provide basic permanent way skills to their engineers. The 507 STRE itself has limited permanent way members at present, so Gavin and colleagues are training other specialists within the unit in basic trackwork skills. This also helps reservists to seek future civilian employment in the rail industry. This varied training experience has proved to be helpful to managing his Network Rail teams.
A crucial capability
507 STRE occupies a unique and increasingly vital niche within both the British Army and the rail industry. By combining frontline military engineering with the everyday expertise of Britain’s rail professionals, the unit ensures that even in the most unpredictable environments, the railway can continue to do what it has always done best – move people, equipment, and supplies where they are needed most. In an era of growing international uncertainty, the skills applied in the ‘last 200 miles’ may prove just as important as anything built on the national network.
If the appeal of working in railways in the Army Reserve appeals to you, the Royal Engineers Infrastructure Recruiting Team can be contacted by following the QR code or by contacting: [email protected].