What I would love to see were some 1980's era partially enclosed autoracks. Not certain when these started to show up, but I'm seeing most pictures online of then from the early 1980's up to 1995ish. Seems a bit of a gap imo in n scale freightcar offerings, at least for my purposes. Athearn did a Southern car with white sides a few years back, an I've seen at least one in a video shot in 1991 in my area of interest, but that particular car wasn't by any means common. I know the roof can be removed from the Red Caboose rack, and that's definitely a project for the future, but not the same car I'm talking about.
Be a nice prototype for someone to do. ST maybe?