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Run through power is common nowadays--RR A interchanges a train with RR B--it just happens to be a coal train, intermodal, or some other hot train. It is easier for RR B and easier to keep a schedule to use RR A's engines and run the train to its destination than to swap engines. RR B in turn will either pay RR A for the use of their engines or more likely, will let RR A use a number of their engines to pay back the "horsepower hours". An SD40-2 will be on RR A a while longer than the AC4400 that RR B let RR A on that hotshot. Equalization of the HP hours.
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