Post 80s 6 axle diesels (scheme doesnt matter, they get patched or repainted to my RR)
50-60ft flat cars
depressed center flat cars
heavy wieght and smooth side passenger cars
60ft boxcars
Bulkhead flats
Coil cars
Kadee Logging/Industrial caboose
LPG/Ethanol Tank cars, min 30k
The bigger and more unusual, the better
