TBM Caroline lifted out of vent shaft at Green Park Way, Greenford - 25 May 2025

HS2 lifts Tunnel Boring Machine (TBM) ‘Caroline’ from below ground at the Green Park Way site in Greenford, West London. On Sunday 25th May, engineers working on the HS2 project lifted the TBM 9.48metre diameter cutterhead, front and middle shield, weighing 850 tonnes, using a large gantry crane. The tunnelling machine concluded its 5mile journey from West Ruislip in April, arriving in an underground reception chamber. TBM Caroline excavated over 1.2 million tonnes of earth and installed 4,217 tunnel rings.

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TBM Caroline lifted out of vent shaft at Green Park Way, Greenford - 25 May 2025: HS2 lifts Tunnel Boring Machine (TBM) ‘Caroline’ from below ground at the Green Park Way site in Greenford, West London.

On Sunday 25th May, engineers working on the HS2 project lifted the TBM 9.48metre diameter cutterhead, front and middle shield, weighing 850 tonnes, using a large gantry crane. The tunnelling machine concluded its 5mile journey from West Ruislip in April, arriving in an underground reception chamber. TBM Caroline excavated over 1.2 million tonnes of earth and installed 4,217 tunnel rings.