It's the red wire that carries the power through the rails. If a short occurs on a portion of the layout on the other side of where a lock-on is attached, the short passes through the small ribbon trace and burns it up. MTH sells that PCB; I have replaced lots of them. The thing to look for is warping of the plastic under the points. This can inhibit movement, but sometimes can be clearanced with a dremel. Placing a wire next to to the PCB may inhibit movement of the white plastic part of the mechanism. A quick fix is to leave that PCB in place and just solder the short straight center rail between the points to the wide center rail as this will effectively jumper the red wire on the PCB.
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