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Hi. The Dynameter car was designed to be pulled between the engine(s) and the rest of the train and though the equipment in side the dyno car could calculate the pulling power of the engine. The calf engine is nothing more than an engine built without a cab and was basically a cost cutting thing. They would need a mother engine, one with a cab to operate and were used like "B" units. Hope I Helped and I'm sure someone esle out there will have more details for you, but that is the basics of what they were. Jamie
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