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[quote user="wjstix"]Just to confuse things, diesels (and electrics) use a combination letter + number  system: A=1 powered axle, B= a truck with two powered axels, C= a truck with three powered axles, D= a truck with 4 powered axles. Numbers are used to show non-powered axles.So for example a GP-9 is a B-B engine - 2 two-axle trucks with both axles powered. An SD-9 is C-C, 2 three-axle trucks all powered.An E unit, say a E-9 passenger engine, at first looks to be C-C also, but it really is A-1-A / A-1-A, meaning the it has 2 three-axle trucks, but only the outside axles are powered, the middle one is an idler (the "1") and unpowered.Confused yet?? [%-)][/quote]The only part that confused me was.......A=1 powered...................confused yet. Maybe if you wouldn't mind explaining that system with an engine I can look at would help like say a GP-40. thanks Norman....
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