HS2 CHIPPING WARDEN TUNNEL & EDGCOTE VIADUCT - 4K DRONE - 24TH AUGUST 2025

The Chipping Warden Green Tunnel will stretch for 2.5km (1.5 miles) through Northamptonshire. It is one of five green tunnels, which are shallower tunnels that will be finished with trees, plants, and shrubs on top – helping them blend into the natural landscape that are being built. Materials from the excavation are kept on site and then reused on the tunnel surroundings, reducing movement of spoil.
Designed as an ‘m-shaped’ double arch, the tunnel will have separate halves for southbound and northbound trains – each one the height of two double-decker buses. Instead of casting the whole tunnel on site, five different concrete precast segments are slotted together to achieve the double arch – one central pier, two side walls and two roof slabs. All 5,020 segments are steel reinforced, with the largest weighing up to 43 tonnes.

Edgcote Viaduct -
Set low into the landscape, the 515-metre-long Edgcote Viaduct will carry the railway across the floodplain of the River Cherwell, south of Chipping Warden.
A major construction milestone has been reached on the Edgcote Viaduct in West Northamptonshire, with the final pier now successfully installed. The structure, which will span 515 metres once complete, is being delivered by the Edgcote viaduct team — a collaboration between Eiffage Kier Ferrovial BAM JV and FC Civils Solutions.
Each of the 40 piers weighs around 70 tonnes and is precision-manufactured off-site by pre-cast specialists PACADAR in Kent. Once transported to site, the piers are lifted into position using a tandem crane operation — with one crane lifting the pier horizontally, while a second rotates and lowers it vertically onto the pile cap.
The viaduct’s final design features two beams per span — a significant improvement from the original five-beam design. This streamlined approach not only accelerates construction but also reduces the carbon footprint of the structure.

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