London's first major extension to the Underground network in over two decades has opened to passengers, following a challenging six year project to bring the Tube to Nine Elms and Battersea. The Northern Line extension runs for 3.2km in twin bore tunnels from Kennington and - despite opening nine months later than originally planned - came in ￡160M under a revised budget of ￡1.26Bn set in 2016.
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