A 1995 Stock train speeds out of a station.
The Northern Line is a line on the underground railway system, London Underground. It is coloured black on the Tube map.
It is mostly underground (deep lvl) and serves the southernmost and some of the northern most stations, running in a complex north south with branches arrangement because originally it was built by lots of companies. On par with the Jubilee line it is the deepest line. It uses similar stock to the Jubilee line as well (1955/ 1956 Stock).