HS2 completes first ?green tunnel? as Copthall milestone signals construction momentum

Rail Technology Magazine - HS2 has reached a significant milestone with the completion of its first cut-and-cover ?green? tunnel, marking visible progress on Britain?s new high-speed railway. The 880-metre Copthall tunnel, located near West Ruislip on London?s western edge, is the first of five such structures along the route between the capital and the West Midlands to be fully completed, including its earth covering.