I've posted this elsewhere - but, no responses so far. I know there is a railway museum wanting to turn scrap iron into cash:

I have a person wishing to purchase one narrow gauge truck. It will not be used on live tracks - so here's an opportunity for the worn wheels truck set you have laying around. Any gauge between 24" - 36" OK.

If you want to sell it, please pass along a photo, location, asking price and your ability to load it out.

Thanks.

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Jim Lundquist