IMO Interesting to note that we had spent a fair amount of time on Weaver plastic truck cars that seemed to de-rail all the time. We noted that de-rails were usually on switches or crosses where there was channeled guides. In most cases the wheels would ride-up on the guide sections of the switch or cross and de-rail. Conclusion was that the wheels were too-close-together. We adjust the wheel set out, so that the flanges would negotiate the restricted areas of the switches or crosses. De-rails significantly decrease.
Maybe you could use an Atlas track cross as a wheel gauge, that's what we used.
Fort Pitt Highrailers
Mike CT
