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"Pulling the pin" while it started with link & pin coulpers still applies today as every locomotive coupler has a top lock lifter. So when you operate the uncoupling lever it pulls the lock lifter part of the way up out of the coupler. The part of the lock lifter that raises up out of the top of the coupler while not round does looks like a pin. [img]http://img262.imageshack.us/img262/1056/coulperparts001bc0.jpg[/img]The correct name for testing for cracks in a coupler is "Magnetic particle inspection" or as it is commonly called Magnafluxing after the Magnaflux company that pattened the procedure and equipment in the mid 1930's.http://www.magnaflux.com/index.asp
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