jis
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More so when you are doing an articulated train set and are able to use what amounts to tenders to spread out the weight and of course potentially powered axles too.Remember, a diesel locomotive is basically an electric locomotive that is carrying the source of the electricity on its back. The question really gets down to weight per axle. Generally electric locomotives, in addition to carrying the equipment to convert 25kV AC to motor appropriate current have weight added to provide for effective adhesion. If carrying the diesel engine makes the whole thing too heavy, then the issue is to lighten the power plant or to have more axles. So, to say that an engine is speed limited solely because it is diesel powered is actually an error in concept.