The Northern Line is the second busiest line on the London Underground network and it serves some of the most popular destinations in the capital. Perhaps that is why it is so difficult to get a seat on it.
Running between north London and south London, it is much used by commuters and tourists alike. In September 2021, the line was given an extension, from Kennington to Battersea, and two stations opened: Nine Elms and Battersea Power Station.
