John, I have a number of the these box cars and so far I have only had one that the coupler would keep opening up under load. On my layout the curves are 0-89 and 0-96 which may make a difference. I placed that car at the end of the train and no more problems. I believe thos are the same type couplers as used on the scale auto racks to help them negoiate a smaller radius. It could also be the pin dropping out because the plate could be bent down causing the pin to drop out or the pin itself is too short. Just my thoughts..........Paul 2
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