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All of the prewar EMC locomotive names were based on the horsepower in hundreds. E stood for eighteen hundred, F stood for fiftyfour Hundred Look at the ads for the FT, it was marketed as either a fifty four hundred horsepower locomotive (4 units) or a twenty seven hundred horsepower locomotive (2 units). So the letters in the FT stood for both horsepower levels that the locomotive was marketed as. The TA used the same nomenclature as the E. The T stood for twelve hundred horsepower "A" unit. The switchers are a little bit more complicated. The first letter stood for the horsepower, the second for the type of frame. So an SW was six hundred horsepower with a welded frame. An SC was six hundred horsepower with a cast frame. The NW and NC were the same except that the horsepower was nine hundred. After the war EMD kept the same letters for the series, even though the letters no longer had meaning. The marketing department later came up with F for Freight, E for Express and SW for switcher to give the designations some meaning for the later locomotives. But the letters originally stood for the horsepower of the locomotives. The new series introduced after the war used different naming. GP for general purpose, SD for special duty (remember that the SD7 and SD9 were designed for branch lines with very light rails), and BL for branch line.
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