When I was running the Flyer style couplers on my AM cars, I found that if they uncouple mysteriously, it was due to the "weight" snagging on a switch point, guard rail or cross over. There has to be a bit of clearance from the rail head to allow for track irregularities. Once adjusted, they worked fine, but I like the look of the scale sized ones a bit better. I also drilled another hole in the shank to allow for closer coupling.
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