What is copthall-green-tunnel? Definition for copthall-green-tunnel in construction & building

HS2 - Progress on HS2’s Copthall Green Tunnel (as Western portal is complete) 15062023

Engineers working on the HS2 project are celebrating progress as they have completed the western portal of the Copthall Green Tunnel. Located in Hillingdon, the 880m long tunnel structure sits between the twin bored Northolt Tunnel and the Colne Valley Viaduct.

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