Is this a Thrall ballast car?
THE CAR TO THE LEFT is common around Augusta, GA, where I live. There is a large, old historic quarry where gravel is dug and used by CSX as ballast. I believe Thrall manufactured this car some time ago. (Thrall is now Trinity). Oddballs Decals makes decals for this car in both N and HO. Athearn owns the former Roundhouse/MDC model of this car. Until I found the Athearn car I was afraid I would have to scratch build it, and THAT skill is way beyond my abilities at the moment.
The sides are quite tapered...
I gave Kel Cruise of the former Mocalova Model Works a bunch of pictures that he was able to use to make the dump chutes for a model of this car. I bought 20 sets in case I ever actually get that far! I have a total of 21 car bodies, some are undec body-only while quite a few need to be stripped and painted. What color? ATSF Mineral Brown? Hmmm? What about brake cylinders? I already have 20 sets of crushed stone loads from Hay Bros. Garage to fill the cars
Herzog's process looks rather interesting.