e/London Underground 1956 Stock

Information
has gloss	eng: Before mass production of the 1959 tube stock, 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 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.
lexicalization	eng: London Underground 1956 Stock
instance of	c/London Underground electric multiple units