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Asketh Train Guy 3: "When the USRA was around, wasn't there a requirement for all steam locomotives with a firebox over 80 sq. ft. to have an automatic stoker?" I don't think it was a grate area requirement; it was probably a combination of grate area and weight on drivers. The only USRA designs available without stoker were the two switchers and the light Pacific, which was equipped with a coal pusher. The light Mikes had a grate area of 66+ sq. ft. and they were stoker-fired (the Southern got duplicates in 1923 that were shovel fired). Everything else (heavy Pacifics, both Mountains, heavy Mikado, both Santa Fes), was in the 70-80 sq. ft. range except the Mallets which were, of course, larger. Old Timer
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