Derailing on turnout

I don't have any Trackmaster tracks, but I think the characteristics should be similar to Tomy. Derailment depends on what your layout looks like. In the picture below on the left, the train is very likely to derail as the height of the yellow part isn't very high to make sure the the wheel doesn't go over when turning. The same happens to the Y shaped track. If your train is going from a straight portion to curve, there shouldn't be any problems. Also, if the train is too fast, it's more likely to derail. Derailment isn't something unusual.

Yes, it does seem to depend on whether the front wheel is rubbing toward the straight or turning side of the turnout. When it's rubbing toward the straight side, it's far more likely to derail. However, on the TM track at least, I don't think it has anything to do with the plastic moving switch. The derailment happens at the red circle:



I think I'm going to see if I can fix it with a shunt on the diverging track's outer rut. Something that will keep the inner wheel from getting too close to that red circle.

"Derailment isn't something unusual."
I will not accept defeat so easily!

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Putting a shunt there fixed it. Now I just have to find to do it with something more permanent than playdoh...