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1) A dynamometer car is usually plugged-in right behind the locomotive/s. This car carries all sorts of electronic equipment, and is designed to give accurate measurements of the tractive effort and horsepower of the loco/s. <br /> <br />2) A "calf" is a locomotive without a control cab. Usually these are the smaller yard switchers, like SW9, SW1200, MP15. These switch engines were either ordered this way, or modified so there is no control cab. The controls are hooked up to the "cow", or identical unit with a cab. The engineer in the lead unit controls both with one set of controls. Most likely you will hear the terms together, like; "cow/calf" as you can't run the calf by itself.
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