 The decision to install MB Type 1 mechanical stoker equipment (capable of feeding up to of coal per hour) on a locomotive with only a grate reflected improved postwar working conditions for locomotive firemen, the varying quality of postwar coal and the expectation of sustained high speed operation of the locomotive.The manually fired prewar VR S class Pacific, although capable of 2,300 drawbar horsepower (1,700 kW), was limited by the physical ability of the fireman to feed its grate and as such was reliant on coal with a high calorific value.Online locomotive database steamlocomotive.com notes