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    UKP: LNER A3

    Steam loco

    A3 Class 4-6-2

    The LNER Gresley A3 class locomotives represented two distinct stages in the history of the British 4-6-2 "Pacific" steam locomotives designed by Nigel Gresley. As A1's they were designed for main line passenger services and later express passenger services, initially on the GNR, a constituent company of the LNER after the amalgamation of 1923, for which they became a standard design.

    The change in class designation to A3 reflected the fitting to the same chassis of a higher-pressure boiler with a greater superheating surface and a small reduction in cylinder diameter, leading to an increase in locomotive weight. Eventually all of the A1 locomotives were rebuilt, most to A3 specifications. One was named after the company's most famous long-distance passenger train, the Flying Scotsman. 78 were built, but Flying Scotsman is the sole member of the class to be preserved.

    Length 70ft
    Height 13ft
    Introduced 1922
    Withdrawn 1966
    Wheel Arrangement 4-6-2
    Builder Doncaster Works & North British Locomotive Company
    Weight 97.79t
    TE 32,910 lbf
    Driving Wheel Dia 6ft 8in
    Wheelbase 60ft 10 3/5in
    Boiler Pressure 220 psi
    Num Cylinders 3
    Valve Gear Walschaerts (outside) Gresley conjugated (inside)
    Cylinder Dimensions 20 in × 26 in
    Number Altnumber Name Status Livery Depot Pool Base Owner
    60103 9887217424472503103E103 Flying Scotsman A GRN YM MBSL National Railway Museum NRM