AOL.com Video - London's 'Tube' Is 150 Years Old

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London's "Tube" Is 150 Years Old

Description:London's underground railway transports around four million people every day. When it opened on January 9th, 1863, it was the world's first such system and was a welcome relief to the very crowded city, says historian Christian Wolmar. (1:24)

Source: Reuters

Tags: reuters , Christian Wolmar , london tube , london underground