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I am not advocating that slack be eliminated.  I see no practical, cost effective way of eliminating it.  I have tried to make it clear that slack does have an advantage.  I have acknowledged that several times.  I am thoroughly familiar with how slack is used during switching. When railroading began, they had slack.  It was just a consequence of couplers that were made lose enough to easily couple and uncouple.  Nobody foresaw the potential downside of slack because trains were so light and short that slack did not pose any problem.
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