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Here is another question for you. Many times you see a loco with additional letters and/or numbers behind the model type. Instead of Alco RS 2 you might see RS 2u and instead of RS 3 you might see RS 3mk. Other examples of this are C425M, C425M/AC, and RS 2r. Is there a "standard" that defines what each letter stands for. I do know what some of these mean. But I figure if I don't know them all then other people might not either. So I ask not only for myself but for all who might wonder but don't know. [8D]
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