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Hi Scott, <br /> The big advantage for a GP-60 verses an SD-60 is higher top end speed. The high horsepower units with 4 axles (GP-60, B-40-8), means that you have all that horsepower feeding 4 traction motors for fast, light trains. Now the advantage of the six axle units are more tractive effort for heavy trains. <br /> As far as the dependability of the GP-50s I know that all the railroads that had them hated and that is why very few GP-50s and SD-50s are still in service. <br /> Dave
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