Years ago, I bought an MTH Premier 0-8-0 steam engine (PS2) with the scale wheel option. It has smaller flange depth and wheel tread but with pickup rollers to run on 3-rail track. A while back I tried to run it (for the first time) and it derailed on the curved route of an Atlas O-54 switch which the version with 3-rail wheels negotiates without difficulty. The 3-rail version with standard wheels is advertised as O-31. Just thought I would mention it.
MELGAR