Dangerous railcar coupling.
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Previously:
https://www.homemadetools.net/forum/...727#post193925
https://www.homemadetools.net/forum/...872#post194453
https://www.homemadetools.net/forum/...412#post196709
https://www.homemadetools.net/forum/...632#post182482
https://www.homemadetools.net/forum/...792#post178972