First pier cast for HS2’s Colne Valley viaduct

Construction of what will be the UK’s longest railway bridge has taken a step forward as the casting of the first of 56 concrete piers has been completed.
Stretching for 3.4km, the viaduct will carry HS2 trains over the Colne Valley on a short overground stretch between West Ruislip and the tunnel mouth next to the M25 motorway. Set low into the landscape, wid spans will carry the viaduct crosses the lakes, and narrow spans will be for the approaches.
The final design is by Grimshaw, based