Yeah I havent done any testing in MP, but hopefully this next update will improve it in MP as well!
No no youre good man! The GP50 is quite a bit different looking than the GP38 model that I do have, butt I agree that Norfolk Southern ECO paint job looks fantastic! and I hope you enjoy your train line for use on your farm! the Coal hoppers can unload from underneath, so any sell point that is in the ground (even the in game sell point I think is what I have used?) you should be able to unload the coal cars into a sell point below