The Victoria line was built to link King's Cross, Victoria and Euston and proposed names included Viking line, for Victoria to King's Cross, and Walvic (Walthamstow to Victoria).
Tunnelling close to Buckingham Palace and major government departments, 2.500 miners excavated an estimated one million tons of earth, uncovering fossilised marine molluscs and human bones from an old plague pit along the way.
SOURCE: David Long 'The Little Book of London Underground'
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.