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Mick, I am a civil engineer who happens to like choo-choos. I imagine a knuckle break is something like this ... Usually ascending a grade, a knuckle will break in a car near the engine where the drag force is greatest. Then when the air hoses come apart the breaks stop the runaway. The crew contacts the dispatcher and backs the engine(s) to the cars. The crew gets out and replaces the coupler (exactly how I don't know). The crew replaces the air hoses, checks the train and pulls out. Then they contact the dispatcher and tell them they are underway. One question I have, I usually see no more than four engines at the front of a train. Is that about the limit of a knuckle? How much horsepower and force does it normally take to break a coupler?
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