In my Sn3 collection is one of those side dump cars Derrell mentions, which I believe was scratch-built by Jan Rons (?). I may be mistaken who built it (it was one of the artists), but I think it also took first place at one of the Symposiums. Here are some pictures:
Nice model D. Both you and Big D have built these cars. Doug built one in 1/2 scale - outstanding model. Of Course, Bob Stears has built a master for such cars in 1/4 for the Cimarron works line. And Theo Berlyn imported a fair model from Korea (wood and brass) several years ago. I hope to getting around to doing a couple in Sn3. Eric Brocker offers a kit in HOn3 iirc thru Rio Grande Models. Harry Brunk built several HOn3 cars for the Union Central and Northern. Others should pipe up and show us pich-chers too.