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Do they always derail at the same places? Could be kink(s) where track sections join that are just enough to reduce the radius at that one point. Depending on wheel play, some locos may complain while others track fine. <br /> <br />A kink will derail 3 axle trucks as the middle axle hits the kink and fights the lead axle. Often the derailment is not noticed until the loco arrives at the first turnout, sometimes the wheel will actually re-rail itself and you never notice the problem. <br /> <br />If it is a kink, rather than tear up and re-lay track, file the inside rail slightly at the kink to widen the gauge at that point. Then the middle axle won't try to keep the truck going straight. Good luck!
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