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Firstly, check that the wheelsets are in gauge (your LHS should be able to sell you a gauge to check this and may be able to help is they're out of gauge - with N scale adjusting this is a very delicate operation). Also, check that the trucks are free to rotate and can also rock a little fore and aft and side to side - sometimes a wire can become trapped and stop the truck from moving freely. I'm unsure from your question whether you mean that the switcher is derailing or that the cars behind it are derailing - if this is the case, and they pose problems with your other locos, try adding some ballast. <br /> <br />If these fail, try running the loco slowly over the trouble spot and watch what happens. I had a series of puzzling derailments caused by Kadee magnets until I realised that the back to back on my locos was set too narrow, causing the loco to run up onto the uncoupler ramp and jump the rails!
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