A key viaduct that will take HS2 trains across the A413 and local rail lines south of Wendover has given the green light by Buckinghamshire Council.

The striking 345m long viaduct is the latest major structure to gain design approval, as construction continues to ramp up on the UK’s new high speed railway.

Once complete, the viaduct will carry high speed trains between London and the North, helping to improve connections, free up space for more freight and local trains on the existing railway and provide zero carbon journeys for people across the UK.

Set low into the landscape, the viaduct’s enormous girders will be made from weathering steel, which naturally ages to a characteristically dark russet finish to echo the natural tones of the surrounding landscape.

Designed to be seen from close-up, the viaduct is one of only two places in the Chilterns where the HS2 route will be above ground level, with the underside of the viaduct just 6m above the road, supported by five ‘Y’ shaped piers.

Structurally, the viaduct girders will use an innovative ‘double composite’ approach, like the nearby Wendover Dean Viaduct. This involves two steel girders sandwiched between two layers of reinforced concrete to create a super strong but light weight span – which will dramatically cut the amount of embedded carbon in the structure.

Both viaducts were designed by HS2 Ltd’s main works contractor, EKFB - a team made up of Eiffage, Kier, Ferrovial Construction and BAM Nuttall - working with their design partner, ASC (a joint venture between Arcadis Setec and COWI) and specialist architects Moxon.

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