RJR posted:The track gauge could be off or a wheel could have moved on the axle, so that the flanges are too far apart to make the curve. I've had both happen.
That can happen even with MTH Premier engines? I might expect it from Railking engines.
Like I mentioned earlier I think the track is off at the transition area.
I replaced the O gauge tubular 042 curves with Gargraves 042 & Gargraves straight track and don't have an issue so far.
Lee Fritz