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  [quote user="henry6"]Not only are you talking 50 feet in one hundred car train, but also the slack pulling out is more severe fhe further back from car one you go...the jerk action is trementous at the 75th thru 100th! [/quote] But we are talking about a pressure change inside of a closed system.  The volume of that system can have nothing to do with train length changing due to slack.  But apparently, the closed system can leak as the distance between each car is changed due to slack. I wondered how the severity of slack could have any effect.  I assume the answer is: the greater the severity, the greater the slack distance between each car, and therefore the greater the potential to rotate the glad hands.
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