I don't believe a traction tire would cause a derailment, unless it was loose on the driver and about ready to fall off. Does the loco derail going in the opposite direction? If not, then your track is the problem. You should be able to crawl through the Ross switch unless there is a problem with continuity of the center pickups, or if it is 2-rail/3-rail one of the drivers is not grounding properly.
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