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    UKP: SR: MN

    Steam loco

    Merchant Navy class 4-6-2

    The SR Merchant Navy class (originally known as the 21C1 class, and later informally known as Bulleid Pacifics, Spam Cans – which name was also applied to the Light Pacifics – or Packets) is a class of air-smoothed Pacific steam locomotives designed for the Southern Railway by Oliver Bulleid. The Pacific design was chosen in preference to several others proposed by Bulleid. The first members of the class were constructed during the Second World War, and the last of the 30 locomotives in 1949.

    Incorporating a number of new developments in British steam locomotive technology, the design of the Merchant Navy class was among the first to use welding in the construction process; this enabled easier fabrication of components during the austerity of the war and post-war economies.

    Due to problems with some of the more novel features of Bulleid's design, all members of the class were modified by British Railways during the late 1950s, losing their air-smoothed casings in the process. The Merchant Navy class operated until the end of Southern steam in July 1967. A third of the class has survived and can be seen on heritage railways throughout Great Britain. 

    The Society restoring Merchant Navy class locomotive 35011 General Steam Navigation are working to retro convert the locomotive to its 1950s specification before the class were rebuilt into the more conventional form by British Railways. This includes restoring the iconic air smoothed casing along with Bulleid’s oil bath encased valve gear incorporating chain drive.

    Length 71ft 7in
    Introduced 1941
    Withdrawn 1967
    Wheel Arrangement 4-6-2
    Builder Eastleigh Works
    Weight 99.5t
    TE 33,495 lbf
    Max Speed 105 mph
    Driving Wheel Dia 6ft 2in
    Boiler Pressure 250 psi
    Num Cylinders 3
    Valve Gear Walschaerts
    Cylinder Dimensions 18 in × 24 in

    Photo: MRG

    Number Altnumber Name Status Note Livery Depot Pool Base Owner
    35005 98805   Canadian Pacific S RL MBSL Mid Hants Railway PRE
    35006 21C6   Peninsular & Oriental R GRN PR Gloucestershire Warwickshire Steam Railway PRE
    35009 21C9   Shaw Savill S PR Riley & Son, Heywood PRE
    35010 21C10   Blue Star D GRN PR Colne Valley Railway PRE
    35011 21C11   General Steam Navigation R work in progress to restore to unrebuilt condition with air smoothed casing etc PR Swindon and Cricklade Railway PRE
    35018 21C18   British India Line A GRN CS MBSL West Coast Railway Co. Carnforth PRE
    35022 Holland-Amerika Line S CL Locomotive Services, Crewe PRE
    35025 Brocklebank Line R PR Hope Farm, Sellindge PRE
    35027 Port Line O BQ East Lancashire Railway PRE
    35028 98828   Clan Line O Merchant Navy Locomotive Preservation Society GRN SL MBSL VSOE Stewarts Lane PRE
    35029 Ellerman Lines D Sectioned GRN YM National Railway Museum NRM