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INFRASTRUCTURE

HS2's Northolt Tunnel under the capital is 50% complete

Half of the 8.4-mile twin-bored HS2 Northolt Tunnel underneath London has now been completed

Duncan Moore
A concrete tunnel ring segment is moved into place by TBM Sushila to create HS2's Northolt Tunnel. Credit_HS2

A concrete tunnel ring segment is moved into place by TBM Sushila to create HS2's Northolt Tunnel. Credit_HS2

HS2's tunnelling team is celebrating completing half of the 8.4-mile twin bored Northolt Tunnel underneath London. Four tunnel boring machines (TBM) are being used the complete the tunnel that will...

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