I have a five-car set of Welz cars I picked up from a dealer at one of the Westchester shows. Actually the sale came afterwards--I didn't have quite enough cash for the set at the show, but sent the seller a money order immediately afterwards so he could ship it direct.
The cars have non-operating couplers and inboard-bearing trucks that roll surprisingly well. The end caps can be an issue--the ones on mine had shrunk over the years. Eliot was able to supply replacement castings in a better-grade plastic (supposedly the tooling is/was up for sale--he asked if I was interested ) that I'll someday get around to painting and installing.
My cars also have the aforementioned issue with paper having stuck to the striping. I did obtain some replacement (leftover) decals, but instead of installing them, I'm considering digitizing them so I can draw the new Amtrak scheme over the originals and print modern stripes on decal film, applying them to a clear plastic strip that would serve as the window "glass" before installing them on the cars, thus modernizing them.
Might even do LED lighting if I get that far .
---PCJ