My experience with Fastrack remote-control track switches is that they are pretty much bullet-proof. In four years my only derailments occurred when I placed two O72 switches points-to-points in an S curve. The locomotive would push a car up over the second point rail. Problem solved by cutting/filing an angle on the tip of the point rail. The Plywood Empire Route is a switching Pike with every track switch being thrown several times in each operating session. All O72 with the exception of an O36 switch buried under a mountain.