Thanks for the replies, so the engines rear trailing truck ( the 2 wheeled axle) is derailing. It happens more often trying to go straight through the switch on the oval clockwise as that is the direction of my mainline, but does occur on the diverging route to the yard as well but that's harder to catch since its much slower speed vs the mainline which I like to run 40 SMPH. At 5 SMPH the trailing truck doesn't derail, anything above it does. Now with that being said when the engine is running in reverse going clockwise there is no derailment. I ran the steamer counter clockwise (in the forward direction and reverse direction) and she runs through both switches no problem even at my prefered 40 SMPH and higher just like she used to before I had this issue last night.
