The first underground journey occurred between Paddington and Farringdon via King's Cross on January 10, 1863 on what was then the Metropolitan Railway.
Construction of an Underground railway system in the capital was approved under an 1855 Act of Parliament, although a shortage of funds delayed construction for several years.
After the Metropolitan line launched in 1863, the Hammersmith and City Railway followed on June 13, 1864, linking Paddington with Hammersmith.
The Tube now runs to around 270 stations and is used by around 3.7 million people on weekdays, and 3.2m on weekends.
Some 1.17 billion passenger journeys were made across the entire Tube network last year, including particularly busy periods around the Queen's Diamond Jubilee and the London 2012 Olympics.
Google's search page today features the word 'Google' written in the famous coloured lines of the famous Tube map.
Now considered a design classic, the map was evolved from a design by electrical engineer Harry Beck in 1933. The schematic non-geographical layout has been copied by train and bus companies around the world.
London Underground, in collaboration with the London Transport Museum, is celebrating the Tube's 150th birthday with a range of events over the year, including more Art On The Undergound at every station.
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