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GWR 4073 Class
The 4073 Class or Castle class were 4-6-0 steam locomotives of the Great Western Railway design built between 1923 and 1950. They were designed by the railway's Chief Mechanical Engineer, Charles Collett, for working the company's express passenger trains.
==Background==
The origins of this highly successful design date back to the Star Class of 1907 which introduced the basic 4-cylinder 4-6-0 layout with long-travel valves and Belpaire firebox that was to become synonymous with GWR express passenger locomotives. The Star class were designed to take the top express trains on the GWR with 61 in service by 1914, but after World War 1 there was a need for an improved design. To meet this need Chief Mechanical Engineer GJ Churchward had in mind an enlarged Star class design with a standard No.7 boiler, as fitted to his GWR 4700 Class express freight 2-8-0 design. However, this combination would have taken the axle load of such a design over the 20 ton limit then set by the civil engineers, and in the end nothing came of the idea.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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