Bank branch trains of the Northern Line are stopping at Kennington station again from today.
Four new passenger passageways have been dug as part of the Northern Line extension, which had meant passengers had been unable to interchange for Charing Cross at the station since May.
Final fitting works will still be carried out as part of the project, which once completed will make it easier to interchange and is essential for plans to extend the line to Battersea Power Station by 2020.
Stuart Harvey, TfL’s Director of Major Projects, said: “I’d like to thank customers for their patience while we worked around the clock to construct four new passageways at Kennington.
“When completed, the passageways will make it easier to interchange at the station.
“The Northern Line Extension is an essential part of our investment programme which will continue to improve customers’ journeys and add vital new capacity to the capital’s transport network.”
The work saw engineers dig out 2,000 tonnes of clay by hand and use around 900 tonnes of concrete to support the passageways.
The extension will bring Battersea and surrounding areas within 15 minutes of the city and will support 25,000 new jobs and 20,000 new homes.
TfL said it would also enable the regeneration of Battersea, Nine Elms and Vauxhall.