As far as I know the traction tires are tight on the wheels. The track is an 042 curve that I have a problem with. Both engines are MTH 4-8-4 steam engines used on 3 rail track, there could be a spacing issue with the center rail pick-up rollers. I have used an SD-70 ACe diesel and have no issue with speed going through the Ross switch.
Should I replace the track with Gargraves curves? I have less problems with Gargraves track.
Lee Fritz