Well, thank you for the feedback on random uncoupling. As I have only ONE subway set, I was wondering how common the problem is and whether there was a "manufacturer" fix. For me, I have resorted to small rubber bands around the coupling shaft to keep the locking pin in the hole. I like that better than the prospect of permanently glueing them. And depending on the rubber band used, it may be possible to still uncouple with the center rail electromagnet, if it can overcome the rubber band tension. However, in practical operation, my cars are always run in the same coupled state.
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