The London Underground 1938 Stock was a London Underground tube stock design. A total of 1,121 cars were built by Metro-Cammell and Birmingham RC&W. An additional 173 cars were added to the fleet by the end of 1953, comprising 91 new builds (the 1949 Tube Stock), 76 conversions from Pre-1938 Tube Stock or 1935 Tube Stock, and six unconverted cars of 1935 Tube Stock, and the stock was used on the London Underground until 1988. During their long lives they worked on the Bakerloo, Northern, Piccadilly, East London and Central lines. Ten sets were refurbished and ran on the Isle of Wight as Class 483, making them the oldest passenger rolling stock operating timetabled services on the National Rail network at the time of their withdrawal in January 2021. The trains represented a major technical advance, as all the electrical equipment was located under the floor for the first time. All previous tube stock had large equipment compartments behind the driving cabs in motor cars, which reduced the space available for passengers by about a third. Numbers There were four types of car, one of which was produced in two forms: Driving Motor (DM) – 42 seats, plus 2 tip-up 'A' DM – north/west facing; solid centre buffer 'D' DM – south/east facing; spring-loaded centre buffer Non-Driving Motor (NDM) – 40 seats, no driving or door controls Special Non-Driving Motor (SNDM) – door controls only Trailer (T) – 40 seats, no motors or controls As built, the 1938 Stock was numbered as follows: Use on different lines The 1938 Stock was built as part of the London Passenger Transport Board's New Works Programme 1935–1940. The trains were primarily intended for use on the Northern and Bakerloo lines, with an additional seven trains also being used on the Piccadilly line. As part of the New Works Programme, the Northern and Central lines were to be extended over London and North Eastern Railway (LNER) tracks, and because of a joint working agreement between the LPTB and the LNER, it was necessary for a proportion of the Underground fleet to be owned by the LNER. Accordingly, 289 cars of 1938 Stock (DM numbers 10238–323 and 11238–323, NDM numbers 12117–57 and T numbers 012313–88) were designated as LNER owned, and fitted with plates marked "Property of LNER". Although 129 of these were to cover extensions to the Central line, none of them actually worked