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I have always understood that train brakes going into emergency can derail the train from the effect on slack run-in, run-out, pulling drawbars, stringlining curves, etc. Does anyone know of a pileup that was officially attributed to an emergency application of the brakes? I guess the only way to determine that had happened would be if the engineer made an emergency application, and then a derailment occurred. It would be interesting to know how many times a day, in the U.S., freight train brakes are intentionally placed into emergency versus how many times a day they go into emergency without actuation by the engineer or other crewmember. Are there statistical records of this?
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