A total of eight Tunnel Boring Machines (TBMs) will be used to build 26 miles (42km) of tunnels beneath London to form the central section of the Crossrail route. An event last week gave a glimpse of the scale and power of the huge 1,000 tonne machines as TBM Elizabeth broke through into the new Canary Wharf station box, marking the biggest milestone in the Crossrail project so far.
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