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HS2 high-speed railway has passed a major milestone with excavation of the 8.4-mile Northolt Tunnel now complete.
Two 8.4-mile-long HS2 railway tunnels under west London have been completed after the last of the four tunnel boring machines ...
The UK’s HS2 has passed a major milestone with excavation of the 13.4km Northolt Tunnel under London completed. The ...