U n i t e d K i n g d o m

HS2, High-Speed Rail Line

All projects
Underground Works
Department for Transport, City of London
Align (Bouygues Travaux Publics, Sir Robert McAlpine, VolkerFitzpatrick)
United Kingdom

Design-build of section C1 of the HS2 project

The ALIGN consortium (Bouygues Travaux Public / Sir Robert McAlpine / VolkerFitzpatrick) is in charge of the design and construction of section C1 of HS2, a high-speed rail line that will provide a non-stop link between London and Birmingham. This 13-mile section north-west of London includes a 2.1 mile-long viaduct (Colne Valley Viaduct) and two 10 mile-long tunnels (Chilterns Tunnels). Variable-density TBMs, a technology already used by Bouygues Travaux Public in Hong Kong and on the Grand Paris Express project, will be used to adapt excavations to the specific geological conditions of the terrain. The work also includes the construction of cross passages between the two tunnels, as well as five ventilation shafts.

13 miles of section’s total length
2.1 miles of viaduct’s length
10 miles of Chilterns Tunnels’ length

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