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London Underground 1956 Stock : ウィキペディア英語版
London Underground 1956 Stock

Before mass production of the 1959 tube stock, three 1956 Tube Stock units were built as prototypes. These units were tested on the Piccadilly line and remained in service after production trains were introduced. Later they were transferred to the Northern line, but in 1995 they were replaced as non-standard by 1962 Stock cascaded from the Central line.
==Background==
The introduction of the 1938 Stock released considerable numbers of Standard Stock trains, which were scheduled to make up the shortfall on the Central line resulting from the extensions to the line. However, this process was interrupted by the Second World War, and although much of the Standard Stock had been through Acton Works for refurbishment, it was stored, as the opening of the extensions was delayed. Further refurbishment was carried out as the extensions opened between 1946 and 1949, but the stock proved to be unreliable after such a long period of storage. With the Piccadilly line also needing more trains, a plan for new rolling stock was formulated in 1948.
The plans were for 100 trains, each of seven cars. The British Transport Commission approved the project "in principle" in 1950, and a design contract was awarded to Metro-Cammell. A mock-up of a car body was constructed at Acton Works, and included some features which had been tried out on individual cars of 1938 stock, including some circular windows, and others that ran up above the roof line, to give passengers better visibility at stations. It was originally called 1951 Stock and then 1952 Stock when the programme was delayed. Bodywork would be of aluminium, rather than steel, but the official drawings showed that they would still be painted red, although experiments with unpainted aluminium R Stock were taking place on the District line at the time. The high cost of building the trains, and a decline in passenger numbers, resulted in the plans being shelved in September 1952. When the situation was re-assessed in 1954, London Underground decided to build three seven-car trains incorporating new ideas, and these became the 1956 Stock. They became available in 1957, and a production run followed in 1959. The unpainted exterior was adopted for the prototype 1956 stock and production 1959 / 1962 stock and the interiors were given a blue and grey colour scheme to match.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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