Keith,
I think my issue is more of a track issue after looking at both engines. On one engine the traction tires are old but have not seen any distortion of the tire after looking at it very closely. The engines run great other then one place on my layout.
Have replaced some of the track with Gargraves track and the problem seems to have gone away. While on the subject of track I would say it is best to keep transition sections(adapter pins; Gargraves to tubular) away from curved sections of track, when you have transition sections keep them 2 or 3 track sections from any curve if you have O gauge tubular track to Gargraves track.
Lee Fritz
