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[quote user="NWP SWP"]I wish Athearn had given their U50s and Veranda Turbines dual motors and had all trucks powered but seems that only the inner trucks are powered the outer ones are just dummies.[/quote] The question is, is a second motor needed? If the wheels slip and the motor doesn't get hot when the locomotive is hold back the one motor is strong enough. Powering the outer truck too is a design challenge. You need to design the locomotive in a way that all 4 trucks carry the same load. Otherweise the higher loaded trucks move the train while the lesser loaded already slip. On the other hand you might then need a second motor adding to the complexity like matched motors and decoders for two motors. So there were good reasons to construct the model as is, I think. That the U50 model doesn't pull more than a SD40-2 model isn't ideal. Regards, Volker
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