I'm having a heck of a time finding O scale gons that would be appropriate for scrap metal loading in a 1980s setting. I came up with the Lionel PS-5 (which is a heck of a nice model) and the Atlas Trainman 52' which can be redetailed - but I'd like some more variety. I was thinking about the old American Standard Railgons, but they're really too new for scrap service in the 80s.
Any suggestions on decent 50 foot O scale gons to look for?