OK, can someone explain to me diesel nomenclature? Steamers I get, 4-4-0, 2-10-2, and so on; defined by the number of lead wheels, drive wheels, and trailing wheels under the loco. I get it, but diesels - not so much. They all look alike to me. So what's the difference between a GP38-2 or a SD45 or a FM H10-44 or a Dash 8-40C or a AC6000CW or any other diesel for that matter?