We use functional cookies for a number of reasons, such as keeping the Costain website reliable and secure and to analyse how our site is being used.
Will you accept our use of non-essential cookies?

Yes No Privacy Notice

Enabling more reliable and accessible journeys for passengers in East London

Upgrade of stations and infrastructure of the eastern surface section to support the introduction of class 345 trains and the operational readiness for the new Elizabeth line.

  • Service 1

Network Rail Eastern Region (Anglia Route)

  • Service 1

Consultancy, digital and complex programme delivery

  • Service 1


Key Benefits

Improved reliability of railway operations

with this key scheme contributing to Transport for London’s rail network achieving a Public Performance Measure of 94.2%, based on average reliability, for the year 2021/22

Providing training and employment opportunities

for 15 people. We worked with the Prince’s Trust, helping people who had been unemployed since leaving college to gain construction experience and skills

Significant improvements at thirteen stations

to accommodate the 200-metre-long new passenger trains and provide street-to-platform step-free accessibility

Increasing future capacity through track and infrastructure improvements,

including the installation of new and upgraded overhead line equipment (OLE)


The eastern surface section of the Elizabeth line (Stratford to Shenfield) needed to be ready for the phased introduction of the new passenger trains (the Class 345) in 2017. This was a complex project, spread over many miles of railway and with multiple partner interfaces and systems, and which needed a holistic approach built on collaboration to be successful.

As delivery partner to Network Rail, we were appointed to design and deliver critical enhancements and upgrades to the rail systems infrastructure and key stations on the eastern section of the Elizabeth line between Stratford (Pudding Mill Lane) and Shenfield in Essex.

Track and OLE installation / remodelling (Shenfield London End Junction)


Systems approach

Through early engagement with all stakeholders – Network Rail, Crossrail, the Atkins design team, signalling provider Alstom and supply chain partners - we embedded a systems approach streamlining the design and delivery of the upgrades. By working as an integrated project team from the beginning, we assured delivery and were able to identify opportunities for innovation and risk mitigation. This enabled us to

  • Remodel the junction and track at Shenfield
  • Install new overhead line equipment (OLE)
  • Provide additional train stabling at Gidea Park and Shenfield sidings
  • Connect the Great Eastern mainline to the central tunnel system at Pudding Mill Lane to enable train operations.
Installation of the new platform 6 at Shenfield

The scope of works included general improvements and upgrades at 13 stations along the route:

  • Construction of a new bay platform at Shenfield
  • Extending platforms at key stations to accommodate longer train formations
  • Adjustments to platform edges (stepping and gauging)
  • Installing lifts to provide step-free accessibility at Forest Gate, Goodmayes, Gidea Park and Harold Wood
  • Installing a new footbridge at Harold Wood
  • Refurbishing ticket offices at Harold Wood, Gidea Park, Goodmayes and Forest Gate
  • Installing driver-only operation cameras at all stations in time for the introduction of the new Class 345 trains.
Installation of new and upgrading existing overhead line equipment (Shenfield London End)

Digitising delivery

Digital ways of working enabled the team to deliver the project more efficiently, accurately and safely. We used digital surveying and computer modeling techniques to design platform extensions to accommodate the new nine-carriage trains at several existing stations. Digital rehearsals allowed us to solve challenging engineering scenarios offsite and minimise the time spent by team members in safety-critical settings, for example:

  • When carrying out works during possessions of the railway
  • Lifting modular bridge segments into restricted spaces
  • Installing modular switches and crossings
  • Installing signaling power supplies.
Providing train turnback facilities and stabling (Gidea Park Sidings)


We successfully designed, integrated and delivered multiple systems and station upgrades and enhancements, while managing a large number of stakeholders. As a result, TfL was able to introduce the Class 345 trains on time making passenger journeys more accessible, reliable and comfortable.

These systems also included the installation and commissioning of the latest in-cab driver-only operation (DOO) system, which enables the train driver to make a safety check along the platform before opening and closing the train's doors. This provides significant benefits for passenger safety and efficient train operations.

Once fully operational, the Elizabeth line will be hugely beneficial to London, not only reducing journey times and increasing the capacity of the network by 10%, but by offering an unrivalled user journey and cementing London’s place as a world-class city.  

Track and OLE installation / remodelling (transition and connection to the existing infrastructure at Pudding Mill Lane)

“I am proud to have supported the development of this world-class project, which is a vital component of London’s transport network. By drawing on our extensive experience and fostering strategic, long-term collaboration with our customers and project partners we have delivered a fantastic railway for passengers.”

Martin Baughurst, Project Director at Costain

Contact and social


Lee Davies, Client director
01628 842 444
[email protected]