Stopped by LHS last week and picked up this Lionel 6-27523 Husky Stack #256252 from several years ago. It was part of a stack train. Those cars had an issue with couplers. There is an "ear" on the coupler side that you manually press to uncouple the cars. On curves, even 072, if the car wobbles a bit, the ear hits the wheels and releases. I have several 072 "S" curves. Time to remove the "ears"!
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