Skip to content Skip to main menu

An aerial view of the Werrington Grade Separation project

Werrington Grade Separation

Delivering the UK’s first ever curved ‘jacked box’ portal to increase capacity of the rail network

Customer: Network Rail

Location: Peterborough, Cambridgeshire

Value: £160m

Completion: 2021

hard hat



precast concrete box

location pin with map



in length




cost savings delivered

This project has increased capacity in the area north of Peterborough station, identified as a bottleneck in Network Rail’s Line of Route Capacity Report (2012), due to slower freight trains having to cross the high speed East Coast Main Line (ECML) at Werrington Junction.

Delivering a new ‘dive-under’ track (where one set of tracks tunnels underneath another) has provided an alternative route for freight trains, meaning they no longer need to cross the ECML.

Our team's scope included the construction of a 160 metre curved jacked dive-under below the ECML, twin-bore tunnelling, culvert and river diversions, new footbridge installation, existing bridge modifications, 2 kilometres of piling, track slewing, and various other associated works. The work was delivered in close proximity to an electrified railway line (OLE), 132kv overhead power lines and a live railway.

Project fact

This project featured the first curved jacked portal push in the UK. At 11,000 tonnes, the precast concrete box forming the tunnel weighed more than the Eiffel Tower.

Learn more

This video explains the technical aspects of the project and features interviews with key members of the team.

“The scale and complexity of the engineering on this site is immense. Amazing job Morgan Sindall Infrastructure and Network Rail teams.”

Rob Cairns, Network Rail Capital Delivery Director, Eastern Region (via LinkedIn)

Making a difference

We proposed an innovative alternative solution during the tender that became a UK first, and avoided an elevated aspect of work within a relatively low-lying vicinity. The solution involved planning a curved jacked box around and under the live railway.

We also conducted substantial value engineering during the early contractor involvement (ECI) phase, delivering savings of £10.5 million.

Get in touch

Got a question about our projects? Talk to us!

Enter your email

Related News

A selection of related news


A photo of newly laid track at Barking Riverside as it rises over a newly built viaduct

TfL appoints Morgan Sindall Infrastructure to deliver Beckton Depot improvements

Improved maintenance facilities will ensure a continued reliable service for customers

Read More


Two platforms at Barking Riverside station, each with a train waiting.

Transport for London announces Surrey Quays station delivery partner

Morgan Sindall Infrastructure will deliver major improvements to Surrey Quays station

Read More
View all News

Cookie Policy

By using this website, you agree to our use of cookies. We use cookies to help our website run effectively. Learn more