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I am thinking of freight trains derailing and piling up at speed where maybe 25-50 cars are piled in heap.  I can’t recall ever hearing of one of those types of wrecks that was said to have been caused by the engineer dumping the air, although, I suppose it must happen.  It is just that I have never heard of it happening, so I wonder how often it happens. I would think that that cause would be very easy to determine.  All you need is for the wreck to follow an intentional emergency application.  It does not seem very likely that the derailment could be unrelated to the brake application where the two events just happen to occur about the same time.
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