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I think the Co-Co, is the European for 3 axeled diesels. In the USs, we call them C-Cs. The system Dougal described for you about steam engines is called the Whyte system. This system was designed by a Mr. Whyte (obviously). <br /> <br />Further, most railroads used their own system of classification numbers for their steam locos. Some made sense, others really didn't. For instance, Northern Pacific called it's 4-8-4's class A, while Union Pacific called theirs F-E-Fs. F-E-F stood for Four-Eight-Four. UP made sense, NP's didn't.
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