I have seen too much narrow gauging on the wheels. They are pressed too close together and the flange will pick the point.
The micrometer will tell the story.
Sandjam's fix is worth trying, but I spread the wheels to the same width as a car or tender with a tighter flange to rail.
Some slack is needed to accommodate smaller radius curves, but some wheel sets are just too close.
I dealt with pilot trucks, so the driver wheels would be a royal pain. So, tighten up the points like Sandjam's video.
