London Underground 1956 Stock
Encyclopedia
Before mass production of the 1959 tube stock
London Underground 1959 Stock
The 1959 Tube Stock was a type of London Underground tube train constructed in the late 1950s. They were intended for use on the Piccadilly line, but also saw use on several other tube lines...

, three 1956 Tube Stock units were built as prototypes by Birmingham RC&W, Gloucester RC&W and Metro-Cammell. These units were tested on the Piccadilly Line
Piccadilly Line
The Piccadilly line is a line of the London Underground, coloured dark blue on the Tube map. It is the fifth busiest line on the Underground network judged by the number of passengers transported per year. It is mainly a deep-level line, running from the north to the west of London via Zone 1, with...

 and remained in service after production trains were introduced. Later they were transferred to the Northern Line
Northern Line
The Northern line is a London Underground line. It is coloured black on the Tube map.For most of its length it is a deep-level tube line. The line carries 206,734,000 passengers per year. This is the highest number of any line on the London Underground system, but the Northern line is unique in...

, but in 1995 they were replaced as non-standard by 1962 Stock
London Underground 1962 Stock
The 1962 Tube Stock was a type of London Underground tube train built for use on the Central line. They were used on the Central line between 1962 and 1995.-Construction:The 1962 Stock was built by Birmingham RC&W for use on the Central Line...

 cascaded from the Central Line
Central Line
The Central line is a London Underground line, coloured red on the tube map. It is a deep-level "tube" line, running east-west across London, and, at , has the greatest total length of track of any line on the Underground. Of the 49 stations served, 20 are below ground...

.

Planning for the stock began in the late 1940s, as the Standard stock
London Underground Standard Stock
The Standard Stock title was applied to a variety of Tube stock built between 1923 and 1934, all of which shared the same basic characteristics, but with some detailed differences. This design is also sometimes referred to as 1923 Tube Stock or Pre 1938 Stock...

 stock running on the Central
Central Line
The Central line is a London Underground line, coloured red on the tube map. It is a deep-level "tube" line, running east-west across London, and, at , has the greatest total length of track of any line on the Underground. Of the 49 stations served, 20 are below ground...

 and Piccadilly
Piccadilly Line
The Piccadilly line is a line of the London Underground, coloured dark blue on the Tube map. It is the fifth busiest line on the Underground network judged by the number of passengers transported per year. It is mainly a deep-level line, running from the north to the west of London via Zone 1, with...

 lines was getting on for thirty years old and becoming due for replacement. Originally the replacement was to be called 1952 Tube Stock, but financial constraints meant that the prototypes did not become available until 1957. The production run followed in 1959.

When the 1952 Stock was conceived it had been planned that the trains would be painted red. But in the early 1950s, London Underground
London Underground
The London Underground is a rapid transit system serving a large part of Greater London and some parts of Buckinghamshire, Hertfordshire and Essex in England...

 had started constructing trains out of lighter aluminium alloy instead of steel, and were left unpainted, e.g. the later District Line R Stock
London Underground R Stock
The R38, R47, R49, and R59 Stock cars were built for the District Line in 1938, 1949, 1952 and 1959. R Stock cars were driving motors and non-driving motors...

 trains. The unpainted exterior was adopted for the prototype 1956 stock and production 1959
London Underground 1959 Stock
The 1959 Tube Stock was a type of London Underground tube train constructed in the late 1950s. They were intended for use on the Piccadilly line, but also saw use on several other tube lines...

 / 1962 stock
London Underground 1962 Stock
The 1962 Tube Stock was a type of London Underground tube train built for use on the Central line. They were used on the Central line between 1962 and 1995.-Construction:The 1962 Stock was built by Birmingham RC&W for use on the Central Line...

and the interiors were given a blue and grey colour scheme to match.

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