Hi Mike , I’m sorry to hear that. I have 19 Z-2500 switch machines for over, like 18 years. I think in 18 years I have only replaced one. I have non-derailing on all of them and they work great. Call Dennis Zander if you want to give another try. He is very good about helping and replacing them free. Could there be a possible wiring issue. Good luck for whatever you decide to do. Ron
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