Wheels with rotating bearing caps, Are they more sensitive to derailing on switches?

check to make sure the wheels are gauged correctly.

Other than a manufacturing defect, I can't imagine why that would be true.  I have lots of cars with rotating bearing caps, I've never noticed any issues with them going through Atlas, Gargraves or Fastrack switches, the one I typically encounter.  If they're out of gauge, they'll have more issues.  If they're the same as other types of trucks, what could possibly be different as far as the tracking of the car is concerned?

What attracted my focus was that the last few nights I have been organizing locos and cars of the same era. ( Yes, some of these have not had much exercise.)  I must have run 35 -40 different cars  and 5-6 locos through all my switches.  these two are the only ones to derail.

Bigdodge, I looked for a thread on gauging, no luck. I assume that is checking the dimension between the wheels. Is there a standard on this?

Thanks, we may be on to something.  My coal hopper is 1 4/32 back to back.... otherwise known as an extra 1/32. Seems the easiest way to do this (and hope the wheels don't get eccentric or wobbly) is to make a gauge block of wood to use as a spacing fixture and tap the wheels together, praying for perpendicular results!  

When a wheel passes over the frog in a turnout, there is no rail head present for the wheel to ride on. So the flange actually takes on the weight of the car through the frog. So, depending on the manufacturer and the height of their flange, some wheels rise on the frog, some will pass through perfectly, and some will drop. Wheels with shallower flanges tend to drop off the rail head down onto the frog and then hit the oncoming rail head causing the truck to bounce. For a perfectly smooth ride through a turnout, the wheel's measurement from the wheel surface to the top of its flange must be the same as the measurement from the surface of the frog to the top of the rail. Tall flanges will cause a car to rock through a turnout, but at least you don't get the hard hit and bounce. I have some Atlas high speed turnouts that my large Lionel auto carriers pass through so perfectly, its like the turnout doesn't even exist.