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N&W's class letters did not correspond with what they called steam locomotives; nor did PRRs, Southern's, C&Os, NYCs . . . There were railroads such as the MoP that tried to relate classes to names, usually with a number following that indicated the size of the driving wheels; a 63"-drivered Mikado was an Mk-63, etc. The UP had a letter classification using the first letter of the number of wheels with a number following denoting the chronological order of the acquisition; an original 800-series Northern was an FEF-1. A Big Boy was an FEEF-1 or -2. But the N&W used the entire alphabet for class letters over the years; there were three class As, three class Js, two Ks, two Ms, etc. (not at the same time; the original class Js were all gone before the second ones were obtained, and they were all gone before the Northerns came). Often but not always locomotives of a given wheel arrangement were grouped under one class letter; Y included all the 2-8-8-2s in the various subclasses, but there were 2-8-0s in classes B, F, G, I, and W. Rarest of all on the N&W was the class L, which included just three Roanoke-built 4-6-0s. The PRR used class letters much the same way; the ATSF didn't use class letters at all. Old Timer
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