I have 12 wheels that I purchase from MTH at the time that the first PS-1 Alco PA's came out. They have traction tires mounted. They have a slight camfer on the inner edge of the axle hole. I was intending to use a vice to press them on the axles but never did because I didn't know how to stabilize the floating axle. I was and still am worried that the floating axle with flanged wheels would cause more derailments than I need(ed).
I would be interested to know how to spring, or otherwise, stabilize these axles so the truck tracks well and still maintains traction.