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[quote user="edblysard"] Jumping in here... If the knuckle pin is removed after the knuckle is closed, it will not affect the knuckle and the coupling will remain, be it under slack or tension...in fact the knuckle pin (pivot pin) rattle and jump up and down a lot during movements....if you have the nerves and were dumb enough, you could reach in there while the train was moving and lift it out with little effort. If the lock pin could be made to dissapear while the knuckle was under load or tension, the coupling would remain, right up to the point tension was removed, then the knuckle with the "missing" lock pin would open. [/quote] That would be my take on it completely.
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