I have purchased two of the MTH S gauge reefers and I had a problem with them not staying coupled. What I noticed is that the coupler drops down so that it is not parallel to the track. The coupler would become uncoupled even though the coupler didn’t actually open. When I took off the truck I noticed that the hole in the coupler shaft is larger than the hole in the truck. I solved the problem by using super glue to attach the coupler shaft to the truck so that it is now parallel to the track. It concerns me that if I want to convert to scale couplers that I may not be able to get the coupler off the truck. I’m hoping someone has a suggestion for a less permanent solution.
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