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HS2 completes excavation of 8.4-mile tunnel under London

The fourth of four TBMs completes work on HS2's second-longest tunnel between London and Midlands

Duncan Moore
Miners from TBM Anne celebrate completing the Northolt Tunnel

Miners from TBM Anne celebrate completing the Northolt Tunnel | Credits: HS2

Construction of Britain's new high-speed railway has passed a major milestone with the excavation of the 8.4-mile Northolt Tunnel under London. Completing the excavation of this 8.4-mile-long tunnel...

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