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OK, I've been seeing more and more cars with the words "Do Not Hump!" emblazoned on the side of them, than I ever remember before. Some, such as the "waste water" tanker for work crew trains, or the specially configured cars designed to be linked together to carry new rail (which I guess applies if the cars are loaded, mostly) seem rather straight forward, and obvious, but I've been seeing some real puzzles too, such as plain vanilla looking gondolas, and covered hoppers, making me wonder why? <br /> <br />For you seasoned vets, from your experiances, what qualities in either cars, or the loads they carry, constitute definite "no-no" for the hump?
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