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Interesting tidbits: Alco didn't refer to their offerings as FA's, PA's, and RSD's initially; they used their own scheme such as DL600-B (the RSD-15). The railfans used the clearer scheme so much that they ended up adopting it. In deisel engine terms, A, B, & C are supposed to refer to the powered axles in the trucks, so that a B-B locomotive has two trucks with two powered axles in each, while A-1-A - A-1-A would designate an engine riding on six axles total, with each truck having a powered axle (A) on either side of an unpowered (1) axle. The C-C arrangement is supposed to denote an engine riding on six axles, with three powered axles in each truck. So, the RSC's are an anomaly because the C denotes the unit with an unpowered third axle in each truck, contrary to the above. One might reasonably expect the whole situation to be backwards of what it is, with the RSC's being the all-powered-axles version.
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