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    UKP: SR: U

    Steam loco

    SR U class 2-6-0

    The SR U class are 2-6-0 steam locomotives designed by Richard Maunsell for passenger duties on the Southern Railway. The class represented the penultimate stage in the development of the Southern Railway's 2-6-0 "family", which improved upon the basic principles established by GWR CME George Jackson Churchward for GWR locomotives. The U class design drew from experience with the GWR 4300s and N classes, improved by applying Midland Railway ideas to the design, enabling the SECR to influence development of the 2-6-0 in Britain.

    The U class was designed in the mid-1920s for production at a time when more obsolete 4-4-0 locomotives were withdrawn and derived from Maunsell's earlier SECR K class 2-6-4 tank locomotives. The first 20 members of the U class were rebuilds of the K class locomotives. A further 20 U class locomotives were built in 1928 to fill the gap in cross-country and semi-fast express passenger services after the withdrawal of the K class. The design also continued the standardisation of the Southern Railway locomotive fleet by using parts designed to be interchangeable with other Maunsell-designed classes.

    A total of 50 locomotives were built over three batches between 1928 and 1931, and the design formed the basis for the 3-cylinder U1 class of 1928. They were able to operate over most of the Southern Railway network, gaining the nickname "U-boats" after the submarine warfare of the First World War, and continued to operate with BR. The class saw continuous use until 1966, when all members of the U class were withdrawn from service.

    Four U class locomotives have been preserved on two heritage railways in the south of England.

    Builder Ashford, Brighton and Eastleigh Works
    Introduced 1928
    TE 23,866 lbf
    Driving Wheel Dia 6ft
    Wheel Arrangement 2-6-0
    Boiler Pressure 200 psi
    Cylinder Dimensions 19 in × 28 in
    Num Cylinders 2, outside
    Valve Gear Walschaerts
    Length 57ft 10in
    Withdrawn 1966
    Weight 112.5t
    Number Altnumber Status Livery Depot Pool Base Owner
    31618 A618   1618   D BLK PR Bluebell Railway PRE
    31625 98426   A625   1625   O PR MBSL Swanage Railway PRE
    31638 92838   A638   1638   A GRN PR Bluebell Railway PRE
    31806 A806   196   S BLK PR MBSL Swanage Railway PRE