The London Underground is an all-electric railway system that covers much of Greater London and some neighbouring areas. It is the world's oldest underground system, and is one of the largest in terms of route length. Services began on January 10 1863 on the Metropolitan Railway; most of that initial route is now part of the Hammersmith & City Line. Despite its name, about 55% of the network is above ground. Popular local names include the Underground and, more colloquially, the Tube, in reference to the cylindrical shape of the system's deep-bore tunnels.

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