The London Underground is the name given to the railway system that serves a large part of Greater London and some neighbouring areas.
The London Underground is the world's oldest underground system with services beginning as far back as 1863. Despite its name, about 55% of the network is above ground. Popular names include the Underground and the Tube.
The London Underground has 276 stations and runs over 243 miles of line making it the longest underground railway in the world, and one of the most served in terms of stations. In 2007, the London Underground was used by over one billion passengers, with on average around 3 million passengers daily.
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