I did a poor job of explaining the anti-derailing problem.Since I am not able to post a picture, for whatever reason, I'll try explaining it a bit differently this time.
Imagine the switch is a "Y". The track rails that need to be isolated from the adjacent track section correspond to the inside of top of the "Y". I am not talking about the points but the two fixed rails on the inside. They must not touch the rails of the track section next to the switch. There needs to be a gap in those two rails to electrically isolate them.
When you attempt to change the switch position manually or electrically then the switch will buzz and not be able to be changed. It means those two short track sections are touching the rails of the adjacent track section. The switch thinks it is that a train is entering a switch set the wrong way. Isolate those two rails and I think you'll be ok. All it takes is a gap of 0.010 inches.
LDBennett
