Before the roller surgery, I requested & received from MTH a set of rollers without the black insulator rings at no charge. Performance over the Ross switches was a little better but the stalling persisted. Discussed the issue with Steve Ross B and then told him my next step was to remove the insulator rings, beneath which is a metal recessed groove as if intended for a fat tire. My theory is that the presence of the black plastic raises up the roller just enuf on some parts of Ross switches to cause the center of the roller to lose contact with the power rail. Why on this engine? Maybe more so because of its very short wheelbase. Larger diesels with these rollers don't seem to have this problem, especially those with 4 rollers. Its quite possible that the insulator rings were added by MTH to deal with someone else's switch issue, including their own.
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