Civil works completed on HS2’s first ‘green’ tunnel

High-speed rail project HS2 has revealed its first completed ‘cut and cover’ tunnel at a site on the western edge of London.

HS2 breaks record for Britain’s longest railway viaduct

The deck of HS2’s Colne Valley Viaduct in Buckinghamshire has been completed to break a 137-year old record as Britain’s longest railway viaduct.

HS2’s Colne Valley viaduct is now officially the UK’s longest railway bridge after the completion of civil engineering works.

With HS2 soon to undergo a fundamental reset, it has assessed its achievements in 2025.