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Derailments Caused By Emergency Braking?

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Ed, I hear what you are saying, but it still leaves me wondering.  I agree that if slack run-out can cause a trainline pressure drop it must be due to the slight physical disturbance of the air hoses.  I can’t imagine any other way that run-out could affect trainline pressure. I know the gaskets can seal so poorly in cold weather that it can pose continuous leakage to the point of being a problem.  So, I can see that in cold weather when the hoses and gaskets are stiff, run-out might turn the glad hands slightly and disrupt the gasket seal enough to cause a momentary leak.  And it would only take one hose connection to trigger the emergency application of one car, and then continue on to the whole train. I can see the hoses actually parting in problems with a cushioned drawbar mounting, as you mention, but the reference in the report seems to confine the issue to a pressure loss with no hose parting.  It refers to a brake pipe pressure loss of up to 2 psi, so that must be just a momentary leakage rather than a complete drop associated with hose parting. I am curious because I have heard about air hose gasket problems in cold weather many, many times, but never heard of slack alone causing a pressure drop in the trainline until reading that report.
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