Superpower steam

Superpower steam

"Superpower steam" was a term coined by Lima Locomotive Works in the mid-1920s. It referred to steam locomotives with booster-equipped four-wheel trailing trucks supporting large fireboxes, as well as enlarged superheaters. The wheel arrangements introduced in the 20s for these locomotives included the 4-6-4, 2-8-4, 4-8-4 and 2-10-4. The term "superpower" was often applied to all engines of these wheel arrangements afterward, though many did not have boosters and almost all steam of any wheel arrangement built after that time had large superheaters.


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