150 Years Of The London 'Tube'
On January 9, 1863, the world's first underground rail journey took place between London's Paddington and Farringdon stations on the Metropolitan Railway. Within its first few months, the pioneering subway system was carrying 26,000 passengers a day. Today, that number tops 3.5 million. The London Underground, known as "The Tube," now serves 270 stations and covers 402 kilometers of track, 45 percent of which is below ground. Here is a short photographic history of the London Underground. (23 PHOTOS)