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Derailments Caused By Emergency Braking?

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Here is my general conclusion to this question: Emergency applications are much more frequent due to inadvertent causes than they are to an intentional response to an actual emergency event. I would divide emergency brake applications into three categories of cause:   1)      Intentional response to emergency situation. 2)      Unintentional with cause known. 3)      Unintentional with cause unknown.   I suspect that item #2 is the most common, #3 second most common, and #1 least common. Emergency applications occur at all speeds as well as when stopped. I suspect that the most common damage done by an emergency application while moving is a broken knuckle. A whole range of other types of damage could be caused by an emergency application. During emergency applications when moving, for any of the three categories of cause, I suspect that only a very small percentage of them cause any damage. Within the range of damage possibilities, some damage events would be capable of causing an emergency application had not an emergency application caused the damage event.  For instance, an engineer dumping the air because a car is stuck on a crossing could derail the train.  The derailment could part an air hose, which would cause an emergency application but for the fact that the engineer had already initiated one. What intrigues me most is an occurrence of cause item #3 that does happen to cause damage that includes the parting of an air hose.  That scenario presents a puzzle because it certainly must happen, but it can never be proven to have happened. So what I mean is that dynamiters or kickers must cause pileups, but it can never be proven.
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