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    UKP: BR Multiple Units 503

    Electric Unit

    Class 503 AM3 EMU

    British Rail Class 503 trains were 65 mph (105 km/h) electric multiple units. They were introduced in two batches. The first were in 1938, by the London, Midland and Scottish Railway (LMS) with a further batch (built to a similar design) in 1956 by the then nationalised British Railways (BR). When introduced by the LMS, they were officially known as Class AM3.

    They were designed for, and operated on, the Wirral & Mersey lines from Liverpool to West Kirby, New Brighton, and Rock Ferry. There were few places on their network of closely spaced stations to attain their maximum speed, except for the open section between Moreton and Meols.

    All but one set were withdrawn and scrapped by 1985. The final set was used on special Merseyrail services until 1988, and this preserved set was kept at the Electric Railway Museum near Coventry until moved to the Locomotive Storage Ltd warehouse at Margate. Though never carried on the unit, the set was numbered under the BR TOPS code as 503 019.

    System 650V DC 3rd or 4th Rail
    Builder Metro Cammell of Saltley (Motor Coaches) & Birmingham RCW (Underframes)
    Width 3.02m
    Height 3.48m
    Introduced 1938
    Withdrawn 1985
    Wheel Arrangement Bo′Bo′+2′2′+2′2′
    Power 400kW
    Max Speed 65mph
    Number Altnumber Status Livery Base
    28690 503019   S MAR Cambrian Railway Trust, Llynclys
    29289 503019   S MAR Reid Freight Services, Cockshute Sidings
    29720 503019   S MAR Reid Freight Services, Cockshute Sidings