The first major extension to the Tube since the 1990s is on track to be finished on time, and TfL has released a video of the first successful train journey along the line.

It is hoped the extension to the Northern Line, between Kennington and the new station in Battersea via another new station in Nine Elms, will be open by September 2021.

This will coincide with the wider regeneration of the area, which will bring 20,000 new homes by 2030.

Stuart Harvey, TfL’s director of major projects, said: “Running a train through the new section of railway tunnel is an exciting moment and demonstrates the hard work of hundreds of men and women who are working around the clock to build the first new Tube extension in two decades.

“The Northern Line Extension will support jobs, homes and growth in one of the most exciting new destinations in London, help keep pace with the capital’s rising population, and is creating jobs through the supply chain across the UK.”

The work will mean it would take just 15 minutes to get to the City or the West End, when currently it can take more than half an hour with a journey split between the bus and the Tube.

Councillor Ravi Govindia, leader of Wandsworth Council and co-chair of the Nine Elms Vauxhall Partnership said: “We welcome the announcement of a clear timeline for the Northern Line Extension to Battersea and Nine Elms.

“The new Tube stations will provide a vital route into the heart of the Vauxhall Nine Elms and Battersea opportunity area, unlocking the growth potential of this river-front district and connecting it directly with the rest of central London.

“This extension is part of an extensive package of infrastructure work being delivered, including a new riverboat pier and road improvements to Nine Elms Lane and the wider neighbourhood, all funded by £1.5 billion investment going into the area.”