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Construction of Britain’s longest rail bridge completed - Sir Robert McAlpine

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Construction of Britain’s longest rail bridge completed - Sir Robert McAlpine Skip navigation Aa enter search term Close Accessibility Tool Office Locations X (formerly Twitter) Instagram Facebook LinkedIn YouTube Search site: Close Projects View All Projects View by sector close mega menu

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Read more Meet the Team Search & Apply What's on Latest news Events Capital Ventures Display Search 11th Sept 2025 Construction of Britain’s longest rail bridge completed

Our Align JV has completed civil engineering works on HS2's Colne Valley Viaduct

Play Pause Sir Robert McAlpine News and Comment Construction of Britain’s longest rail bridge completed New images have been released to mark the completion of civil engineering works on HS2’s Colne Valley viaduct – the UK’s new longest rail bridge. Construction of the 10 metre-tall viaduct started in March 2021, led by HS2’s main works contractor for this section of the route, Align, our joint venture with Bouygues Travaux Publics and VolkerFitzpatrick. 

The 2.1-mile-long structure carries Britain’s new high-speed railway across a series of roads, lakes, the River Colne and the Grand Union Canal, north west of London. Trains will operate at 200mph on the viaduct’s gentle curve which is formed of 1,000 uniquely-shaped deck segments.

The last of the giant pre-cast deck segments was lowered into place in September 2024. Since then, Align has been putting the finishing touches to the new landmark, including installation of parapet sections, noise barriers, a structural health monitoring system and waterproofing and drainage.

It means that the Tay Bridge, linking Fife and Dundee, has finally ceded the crown of Britain’s longest rail bridge, a record it had held since 1887.

Coralie Peroux, Align JV project director, said: “I'm immensely proud of the Align team and our supply chain partners, not just for successfully completing the UK's longest rail bridge, but for the remarkable way they delivered it.

"Faced with the technical challenges in design and construction, they harnessed their expertise, worked as an integrated project team, and embraced collaboration. Their efforts have produced a striking HS2 landmark and created a valuable learning legacy for future designers, engineers and construction professionals.”

Billy Ahluwalia, HS2 Ltd's senior project manager for the viaduct, said: “The completion of the viaduct marks more than 10 years of planning, design and construction. I’m immensely proud of the level of dedication and professionalism shown by the whole team to maintain high standards of safety and quality, working over land and water to deliver.

“It’s a remarkable achievement. The viaduct is a structure of international significance - a stunning feat of engineering that will no doubt stand the test of time.”

The viaduct stretches across the Colne Valley near the M25 motorway and the village of Denham. It sits between the 8.4-mile Northolt Tunnel, which carries HS2 services beneath London, and the 10-mile Chiltern Tunnel.

It is the longest of more than 50 major viaducts being built for HS2.

HS2 services will eventually operate on dedicated tracks between London and Birmingham, before reaching destinations further north via the existing rail network. It will significantly boost capacity on the busiest section of the West Coast Main Line while driving economic growth.

Colne Valley Viaduct View Image View Image View Image View Image View Image Find out more about HS2 HS2 completes civil engineering works on longest tunnel 23 Jan 2026 The close of work on the tunnel's vent shafts brings an end to a project our Align JV began almost five years ago

Read more about Significant HS2 milestone as Chiltern Tunnel complete 07 Aug 2025 The construction of the 10-mile tunnel by our Align JV finishes ahead of schedule

Read more about Colne Valley Viaduct scoops two NCE Bridges awards 05 Aug 2025 Iconic structure forms part of the HS2 project being constructed by our Align JV

Read more about Latest news SRM supports Design Engineer Construct! at Agratas 24 Feb 2026 Severfield, steelworks contractor on Agratas' project, has adopted a local school to deliver an award-winning industry learning programme

Read more about Final phase of Hexham hospital redevelopment completed 18 Feb 2026 Phase 3 delivered state-of-the-art operating theatres, modernising surgical facilities to support high-quality, modern care

Read more about NAW: Apprentices at Agratas 13 Feb 2026 Administration Apprentice, Maisie Woods, a resident of Bridgwater, is amongst the ten apprentices employed by Sir Robert McAlpine currently working at Agratas

Read more about View all news Tags HS2 HS2 Colne Valley Viaduct HS2 Colne Valley AlignJV Joint Venture Bridge Construction Contact Us

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