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HS2 completes first ‘green tunnel’ as Copthall milestone signals construction momentum
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HS2’s reveals first completed ‘green’ tunnel
The first completed cut and cover tunnel on Britain’s new high-speed railway has been revealed at a site on London’s western periphery. HS2’s 880-metre Copthall ‘green’ tunnel near West Ruislip has been created using 1.2 million cubic metres of material excavated during construction of the line’s nearby twin-bore Northolt tunnel. Originally planned as an open cutting, engineers opted for a cut and cover design. The decision enabled the Northolt …
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