London Underground's last surviving steam train reached Edgeware Road in the early hours of this morning as part of a test run. It will be used during events on Sunday to mark the 150th anniversary of the opeing of the Tube.
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.