It was the train line they said would never work - but this week the Tube is celebrating 150 years of service.
It was in 1863 that a steam train travelled five miles on the first line - and the UNderground was born. And last night that journey on the Metropolitan line was recreated
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.