I'm planning to buy flat cars that will be carrying card models of tanks at the HO scale. What kind of flat cars would you typically find in the 1950's? Also, is 3 freight cars + 1 caboose realistic when they are being pulled by a F7A? Lastly, I have a powered Athearn RDC and 2 unpowered RDC. The old motor is busted, so I replaced it with a motor from an out of commission Athearn F7A. It seems that the motor is getting hot fast, and it'll probably be busted again. Are Athearn RDCs (rubber band drive) really like this? Perhaps there are inexpensive substitutes for the Athearn RDC? Perhaps those coming from Life Like?