Going to start off with an Atlas 3560 3 bay hopper in undecorated.
Plans are to body mount MT scale couplers or 905's which ever looks better add MbE airhoses, metal wheels or replace trucks with 36" 100 ton with metal wheels.
As for the paint it's going to be an ex TCC car patched out for my road as a group of cars that was purchased after the collapse in the Northeast in the mid 1970's.
This car will either be grey, red or green with TCC decals and the patch out it'll also have some body damage but still be a usable car will be working from proto photos on the damage.