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AHM or IHC truck removal

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  • Member since
    January 2004
  • From: Canada, eh?
  • 13,029 posts
Posted by doctorwayne on Monday, July 25, 2022 12:22 PM

Welcome to the MR Forums, Mopacgrandpa.

I'm not sure about the IHC cars, but the Rivarossi (AHM) cars used a couple types of push-in plugs to secure the trucks.  Some were slightly serrated, and some were split in the middle so they compressed when being installed, and when fully seated, snapped into place.

Trucks with the simple serrated push-in ones can be removed simply by grasping the truck and pulling it away from the car's underbody.

For the expanding one, you might fare better by removing the car's roof, so that you can access the expanded plug - using pliers or a small screwdriver, you can compress the plug and push it out.

Here are some photos of the truck retainers...

These are the simple push-in type (which if removed and re-installed repeatedly, can become too loose to stay in-place)...

...and the split version, installed in a baggage car...

Here's a removed truck with the split pin still in-place...

...and a removed split pin...

As the simple push-in plugs wear and become loose, I've started replacing them using large flathead screws...


  • Member since
    March 2002
  • From: Milwaukee WI (Fox Point)
  • 11,221 posts
Posted by dknelson on Monday, July 25, 2022 11:55 AM

Can't speak to IHC cars but on the old AHM cars the trucks were held in place with a plastic pin that pushed into a hole in the bolster.  I usually had reasonable luck tugging at the truck with a slight rocking motion until the pin slightly raised out of the hole, at which time I could grasp the head of that pin with pliers and tug it out.

Now, having said that, my experience was also that you had a limited number of times to remove and replace that pin before the wear on the plastic would cause the pin to become somewhat loose.  Or, sometimes the pin would break - the head would separate from the shaft.  So the hole would be plugged.

I seem to recall at some point AHM replaced the black plastic pins with ones of metal that had ribs going down the shaft of the pin that were meant to grab onto the hole in the bolster, but my recollection is that those ribs actually accelerated the wear process if removed and replaced too often.

What I cannot recall is whether the hole in the bolster went all the way through the floor.   If it does it might be better to remove the body from the roof (again relying on memory, body and floor were one piece, roof and "window glass" were another) and push down from inside on the pin, rather than pull on the pin.


Slightly OT but the plastic pins on the AHM freight cars were a little easier to remove because the trucks was smaller, and if you removed the wheel sets you could force a thin blade screwdriver between the body bolster and the truck bolster and force the truck, and thus the pin, up a little bit.

Sorry to be vague on some particulars but this is not something I have done, or thought about, in a long time.  Wilted Flower  

Dave Nelson

  • Member since
    July 2022
  • 1 posts
AHM or IHC truck removal
Posted by Mopacgrandpa on Saturday, July 23, 2022 11:49 AM

I have some old AHM and IHC 6 wheel passenger cars and would like to replace the couplers with Kadee#505 conversion bolsters. My question is how do I remove the trucks to do that?  Do I have to remove the body to do that or what method should I use. 

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