American Flyer does have oversized wheel flanges and couplers.

To improve curve running the wheel flanges of the driving wheels were reduced.

An example for this are wheel flanges which tend to be proportionally wider in smaller scales to ensure a reliable operation.

The prerecorded sound of screeching wheel flanges can be heard as trains go around the curve.

The axles were all fixed rigidly to the frame, but the middle one had thinner wheel flanges.

The second axle was driven by the inside cylinder and had no wheel flanges.

As the frog is used, the flangeway will abrade against the wheel flanges and deepen.

This distributes the guide forces between the two axles which reduces wear and tear on the wheel flanges.

The thinner wheel flanges of the driving wheels were completely removed later in order to achieve better curve running.

The driving wheels had no wheel flange, so the locomotive could be operated on small radius curves.