RealTrax Switch Derailing issue

That, or maybe the adjacent piece of track has a rail just a tad too long and is contacting the sensor rail.  Or check and make sure the copper J hook on the adjacent rail isn't bent slightly out of shape and contacting the sensor rail.

I have MTH RealTrax on my current layout (purchasing both new track and used track) and I noticed that the rail length tolerances were a little loose on all the track pieces.  Nothing consistent, I just had to be careful with any piece of track attached to a switch.

That was it! I ended up using some hot glue on the bottom of the sense rails as well as on the end.  Seems to work great,  The glue compresses some when connected to other track which is fine with me.

Another question - I appear to have half blown switch box.  It "pulls" the points but won't "push" them. Has anyone had any luck with finding replacement solenoids anywhere?

Be sure the spring visible on the bottom of the switch straddles the pin connect d to the switch points.

@Jon G The switch itself is not the problem. I've taken the same switch machine to two separate switches and observed identical behavior: It will "pull" but not "push" so I'm thinking it's a bad solenoid in the switch machine.