MTH Part Identification from Premier Passenger Car

Coupler?  G

Could be the spring/plunger assembly that keeps the roller in contact with the center rail.  Check those center rollers on the car in question.

MTH parts photo for reference

The upright or post part looks like it is slotted for a C-Clip, which might not have been put on correctly, and might be part of what fastens the truck assembly to the frame. But if so the truck would be loose, and while I have recently seen something very similar on a steamer trailing truck, I can’t say I have seen this on an MTH passenger car. I’ll look at one of mine later and see if that reveals anything.

Thanks for the info gang. I'm going to take it apart this weekend. I'll let you know what I find out. I suspected it was the roller spring, since it seemed loose compared to the other. I don't see any other loose parts, so hope I'm not missing the pieces that I need to fix it.

These help? Maybe the rivet didn't peen over?

Thanks Bobby. That's it.