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The Central line is a line of the London Underground, coloured red on the tube map. It is the second busiest line on the Underground after the Northern line with 183,512,000 passengers per annum. It is a deep-level "tube" line, running east-west through central London with its termini in the north-west and north-east of the capital at West Ruislip and Epping. The line has the greatest length of track on the Underground, but is not the longest continuous line.

The line traces its origins to the Central London Railway (CLR) incorporated in 1891 for a route between Shepherd's Bush and Bank. The railway opened to passengers on 30 July 1900 with trains initially hauled by electric locomotives, although complaints about the vibrations caused by the engines led to electric multiple unit operation being introduced within a few years. The distinctive station buildings, few of which survive, were designed by the architect Harry Bell Measures. The CLR was extended to Liverpool Street in 1912 and Ealing Broadway in 1920. The current name came into use in 1937 and the line was extended east and west from the central area taking over passenger services on former London & North Eastern Railway and Great Western Railway routes in the late 1940s. (Full article...)