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Randy is right on, because a generator's resistance to rotation when its being loaded is no different than a dynanometer's resistance to turning. In fact, an electrical dyno (vs. a water brake, or friction brake type) is the exact same thing. When a brand new gen-set is finished, it is evaluated with a load bank, which is what dynamic brakes are. Kw/hr, Hp, it's all the same. Larger engines like locomotive engines are not dyno tested because it's not practical to build a dyno for such amounts of power, so other methods of determining performance have to be used, like comparing actual fuel consumption to a BSFC chart, or fuel consumption vs. power generated. Locomotive engines are also far from the biggest engines, some marine engines develope 40,000 Hp, engines of this size are typicaly rated in Kw. Rating output at the flywheel, makes sense to me because while an engine's output can be pretty constant, the power that gets "to the ground" can vary a lot, and this is true for any vehicle or application. In the case of locomotives, it is convenient to measure electrical output even though we know the the engine as a x,000 Hp unit. SD-40-2, right on with the formula.
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