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David, <br />They are mounted on the trucks and connected to the axle via gearing that is enclosed to seal the unit from the debris that kicks up while at speed. The number of electric motors depends on the type of truck ie; passenger, freight and the number of axles. Alco PA's nand EMD E units have two per truck with a center idler axle for a total of four per engine. Your four axle freight and switcher units have one per axle for a total of four. Your big SD's, Century's, CW's all have six axles with one motor per axle. I hope that answers your question. <br /> <br />Mike M
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