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Metropolitan line
The Metropolitan line is a London Underground service that connects Aldgate in the City of London, the capital's financial heart, with Amersham and Chesham in Buckinghamshire, with branches to Watford and Uxbridge. Coloured purplish red on the tube map, the line serves 34 stations in . The section between Aldgate and Baker Street is shared with the Circle and Hammersmith & City lines, between Rayners Lane and Uxbridge with the Piccadilly line, and between Harrow-on-the-Hill and Amersham with Chiltern Railways. Just under 67 million passenger journeys were made on the line in 2011/12. The line is one of the only two London Underground lines to cross the Greater London boundary, the other being the Central line.
In 1863 the Metropolitan Railway began the world's first underground railway between Paddington and Farringdon Street with wooden carriages and steam locomotives, but its most important route became the line north into the Middlesex countryside, where it stimulated the development of new suburbs. Harrow was reached in 1880, and the line extended as far as in Buckinghamshire, more than from Baker Street. From the end of the 19th century, the railway shared tracks with the Great Central Railway route out of . The central London lines were electrified by 1907, but electric locomotives were exchanged for steam locomotives on trains heading north of Harrow. After the railway was absorbed by the London Passenger Transport Board in 1933 the line was cut back to . Steam trains ran until 1961, when the line was electrified to and services curtailed at Amersham. The Hammersmith & City line was shown on the tube map as part of the Metropolitan line until 1990, when it appeared as a separate line. The current S Stock trains entered service between 2010 and 2012.
The track is underground between Aldgate and Finchley Road; unlike the tube railways, the tunnels are just below the surface (cut and cover) and of similar size to those for mainline trains. Of the 34 stations served, nine are below ground. Baker Street is the central London terminus for some trains, others continuing to Aldgate in the City. Most of the route is two tracks, except for the single-track Chesham branch and a four-track section between and that allows fast services to overtake slower trains. There are also four tracks between Wembley Park and , but the inner pair of tracks was transferred to the Bakerloo line in 1939, then to the Jubilee line in 1979, the trains on these lines calling at all stations. The Metropolitan line runs on the outer fast lines.
The Watford branch is due to be diverted to , resulting in the closure of Watford station and opening of two new stations. Construction is due to begin in 2016 and be completed by 2020.
==History==
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