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District Railway electric multiple units were used on London's Metropolitan District Railway (commonly known as the District Railway) after the lines were electrified in the early 20th century. After a joint experiment with the Metropolitan Railway with which they operated the inner circle in London, a four rail DC system was chosen. Following the testing of two prototype trains in 1903, electric multiple units were ordered to replace the steam locomotives and carriages. By the end of 1905 all passenger services used electric traction. More cars were purchased in 1910, 1912, 1913 and 1920 to supplement an expanding railway. In 1923 steel cars were bought to replace some of the early wooden units, in 1926 further units allowed the replacement of most of the early wooden trailer units. In 1933 the railway was amalgamated with the other London underground railway companies to form the London Passenger Transport Board. More cars were ordered to expand the service and another reconstruction programme in 1938 upgraded most the stock to air-operated sliding doors and replace the reminder of the original wooden cars. After the second world war the units were withdrawn as the R Stock, COP Stock, A Stock and finally the C Stock replaced them. ==Origins== In 1903 the District tested two seven car trains on the unopened line between Ealing and South Harrow. Built by Brush Traction, one train was equipped with British Thompson-Houston (BTH) control gear and Christensen air brake, the other with control and brakes provided by Westinghouse; the BTH control and Westinghouse brake were chosen as the more reliable. The cars were long and trains formed of three cars with motors and four trailers. Driving cabs were provided at one end of leading motor cars, at the other end and at both ends of the other cars were platforms with gates. Hand operated sliding doors were centrally placed on the car sides. All cars were open saloons and only third class accommodation was provided. Some trailer cars were later supplied with driving controls and two and three car trains operated from Mill Hill Park to Hounslow and South Harrow and later Uxbridge until they were withdrawn in 1925. 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「District 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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