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I guess that must be what happens.  That is, the slack rotates the glad hands.  I can picture that if the gasket seal between glad hands were physically upset just a tiny bit, it might allow a leak to suddenly burst through, and that burst might last a second or two as the gaskets reset their new position relationship to each other. I found a reference that says the free slack in each coupler is 1”, and the sprung slack at each drawbar is another 5”.  So, that is 12” of potential slack at each joint.
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