Ray,
About the only way to identify those cars would be to find some late forties,early fifties MR or RMC, and check the ads to see which kit manufacturers released what road names. As I recall, those kits didn't have trucks or couplers included, which is why the one would have Varney trucks, and Mantua couplers. I also seem to recall that preprinted car sides were sometimes published in the modeling mag's.
Pete