Tunnel boring machines lowered in Battersea for Northern Line extension - Railway Technology
...The TBMs are set to create two 3.2km underground tunnels to extend the Charing Cross branch of the Northern line from Kennington to Battersea Power Station through Nine Elms Station.
Both tunnelling machines will now be assembled within two 77m-long launch tunnels, before they start their journeys towards Kennington next month. ...
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