I have a Cop & Hobo gondola by Bachmann. I purchased two years ago but never ran it. For those not familiar with this version it is scale length and gear driven, no motor. It does work well however. I was impressed with it's performance.
That said, I placed it on my Christmas layout that has all "O31" curves. It kept pulling the following car off that track when it traversed the curves. I am selling it and am going to use the MPC era version of the cop & hobo car that I just bought. New old stock.
I've listed it on Ebay with the disclaimer about the curves. I wonder if anyone here has one of these and if so, do you have the same issue I described.