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Why so many locos
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<p>Well, I don't know if all of their locomotives are all that modern, but...</p><p>Ruling grade is a big one, plus if a locomotive fails, the train would still be able to limp along (depending on the Horsepower Per Ton [HPT] ratio) but if there's only one locomotive, a single mechanical problem knocks out the entire train, tying up that track until another locomotive can get out there to rescue the train. <br></p>
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