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I haven't used the switch that you have but think that the others are overlooking another possible cause of your problem. You state that the switch is at the bottom of a grade. If the switch itself is on the transition to the grade it would have a vertical curve in it. This might cause a short with a pilot on a steam engine or a metal gearbox on a diesel touching a rail and causing a short. The vertical curve could also cause a wheel to lift if it did not have sufficient play and being on a curve it would tend to go straight causing the derailment. Take a look to see if any of this might be the cause of your problems. Doug
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