Crossrail has begun to assemble its first tunnel boring machines at Westbourne Park.
Crossrail’s tunnelling contractors selected Herrenknecht AG to deliver the first six machines required for the new rail tunnels.
The German tunnelling specialists delivered the machines for the western running tunnels and two TBMs will be built at Limmo Peninsula for the eastern running tunnels in mid 2012, and a further two machines at Stepney Green later in 2012.
To construct the 21 km of twin-bored tunnel required for Crossrail, at least seven tunnel boring machines will be required and will undertake 10 individual tunnel drives to construct the 6 m diameter rail tunnels.
The TBMs required for Crossrail will be up to 140 m in length and weigh about 1,000 tonnes.