Major construction on the 3km twin-tunnel railway between Kennington and Battersea Power Station, via Nine Elms, began in 2015. Despite the challenges of the pandemic, the construction project has stayed on track for an autumn opening.

There is an initial peak-time service of six trains per hour on the extension, which runs from Kennington station on the Charing Cross branch, increasing to 12 trains per hour by mid-2022. There will be five trains per hour during off-peak times, doubling to 10 trains per hour next year.

TfL said it managed to deliver the Northern Line Extension £160m under budget, bringing its estimated final total cost to £1.1bn. This is a far cry from the Crossrail project, which has repeatedly exceeded its budget with recent warnings that it does not have enough funds allocated to finish construction.

Final preparations for the new stations include paving and landscaping work at the front of both, and commissioning of ticket machines...