Most distant places served
Approximate distances from central London
Epping to Liverpool Street 27km (16 miles) - North
Morden to Moorgate 16km (10 miles) - South
Upminster to Tower Hill 25km (15 miles) - East
Chesham to Aldgate 47km (29 miles) - West
A steam train which carried passengers in the 19th Century has returned to mark 150 years since the first tube journey.
A look back at some of the stops on London Underground's 150 year journey.
All day we've been adding fascinating facts about the Tube, which turns 150 years old this week. Now find out how much you know.