HS2 reaches peak tunnelling activity with final west London TBM launch

Construction of the HS2 tunnels under London has hit another major milestone with the launch of the fourth – and final – machine being used to build the giant Northolt Tunnel beneath the capital.
Cutterhead of TBM Anne from the Victoria Road Crossover Box (c) HS2
The 8.4-mile tunnel will run from Victoria Road in Ealing to West Ruislip in Hillingdon – carrying trains in and out of London – and is being constructed by four huge tunnel boring machines (TBMs).
In keeping wit