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Metropolitan Railway electric multiple units were used on London's Metropolitan Railway after the lines were electrified in the early 20th century. After a joint experiment with the District Railway with which they operated the inner circle in London, a four rail DC system was chosen. The first Metropolitan Railway electric multiple units ran on 1 January 1905 from Uxbridge to Baker Street, the circle service began a full electric service on 24 September 1905 and an electric service started on the joint Hammersmith and City line on 5 November 1906. More trains were purchased in 1915 and 1921 to replace and supplement those operating the circle service. In 1927-33 compartment stock was built for use on the Extension line out of Baker Street through Harrow. In 1933 the railway was amalgamated with the other London underground railway companies to form the London Passenger Transport Board. The older stock was withdrawn after replacement by the O Stock in the 1930s, the Circle stock was renovated and was later replaced by P Stock in 1950 and the units which ran on the Extension line were standardised and designated T Stock, and later replaced by A Stock in 1963. ==Electrification== The Metropolitan Railway was opened in 1863 with wooden carriages hauled by steam locomotives, but at the start of the 20th century the railway was seeing increased competition in central London from the new Underground Electric Railways of London (UERL) tube lines and the use of buses. The use of steam underground led to smoke-filled stations and carriages which was unpopular with passengers, and conversion to electric traction was seen as the way forward. Because of the jointly operated ''Inner Circle'' co-operation with the District Railway was essential. A jointly-owned experimental train of six coaches was tested on passenger service on an Earl's Court to High Street Kensington shuttle in 1900. Composed of four trailers and two motor cars this had pick up shoes which made contact with conductor rails energised at 600 V DC on both sides of the track. Although the motor cars were connected by a bus line, there was no multiple working, meaning only the leading motor car was powered. The experiment was considered a success, and following tenders a 3000V AC system was recommended by the electrification joint committee, and this was accepted by both parties until the American led UERL took control of the District. The group was led by Charles Yerkes, whose experience in the United States led him to favour DC, with conductor rail similar to that in use on the City & South London Railway and Central London Railway. After arbitration by the Board of Trade a DC system with four rails was taken up and the railways began electrifying their routes, using multiple-unit stock and electric locomotives hauling carriages. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Metropolitan Railway electric multiple units」の詳細全文を読む スポンサード リンク
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