New O scale coupler lets go near the front of a 20 car train also at the back on the train.
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Item number?
Hence the reason I’ve converted to Kadee. MTH lobster claws are usually pretty good. I would check for bent linkage, or something loose. Compare with its twin.
@Danr posted:Item number?
MTH NKP O scale stock car
If it has the plate on the bottom of the truck that pulls the linkage in the coupler, then the tab on the plate is exerting too much pressure on the linkage and will open the coupler due to excessive load on the coupler or when going around curves as the angle tends to pull the linkage slightly. You have to bend the tab on the bottom plate to reduce the pressure on the linkage. Don't disassemble the truck, because you will never get it back together. Reach in with a tool to bend the tab. Not easy; it's a pain. Did a bunch when at MTH.
I had two trucks with couplers that kept popping open on a Pair of MTH PREMIER Detroit & Mackinac 50' box cars.
I took them off. So far I have been able to bend or readjust one of the couplers so that it closes properly.
Andrew
