"New images show Crossrail’s 'London tunnelling marathon' making good progress"

Link to Crossrail web site

"The new Crossrail route includes a 26-mile (42km) section of tunnels beneath London. Five huge tunnelling machines are now in operation in west, east and south-east London, with over 5½ miles (9km) of tunnels now built.

"Tunnelling is also well underway beneath central London station sites using Sprayed Concrete Lining ‘mining’ techniques to create a further 7.5 miles (12km) of platform tunnels and cross passages."

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