"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, a joint venture between Bouygues Travaux Publics, VolkerFitzpatrick and Sir Robert McAlpine. The last of the giant pre-cast deck segments was lowered into place in September 2024. Since then, Align has been adding the finishing touches, including the installation of parapet sections, noise barriers, a structural health monitoring system and waterproofing and drainage."
"Construction work on the 2.1-mile-long Colne Valley railway viaduct has been completed, ahead of the viaduct being handed over for railway fit-out work. When the HS2 railway opens, trains will travel at 200mph along the viaduct's gentle curve, which has been formed of 1,000 uniquely-shaped deck segments. 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."
The 2.1-mile Colne Valley railway viaduct has been completed and will be handed over for railway fit-out work. Trains will travel at 200mph along the viaduct's gentle curve, formed from 1,000 uniquely shaped pre-cast deck segments. Construction began in March 2021 under Align, a joint venture of Bouygues Travaux Publics, VolkerFitzpatrick and Sir Robert McAlpine, with the final deck segment lowered in September 2024. Align has installed parapet sections, noise barriers, a structural health monitoring system, waterproofing and drainage. The viaduct spans the Colne Valley near the M25 and Denham, between Northolt and Chiltern tunnels, and is the longest of over 50 HS2 viaducts. Significant civil works remain elsewhere on the 140-mile route.
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