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I have noticed on several occasions that the Hornby new Pullman coaches seem to shudder momentarily when pulled by various locomotives, mostly when approaching points. Is this due to the type of wheel flanges?

 

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All my points are located on the straight track and giving access to the sidings. Other coaches like Hornby intercity, show no signs of this fault.

 

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I maybe alone on this one -

new shiny chrome plated wheels now fitted to most modern coaches, are to me only cosmetic. Cleaning the coach wheels of this type of plated wheels, show part of the wheels (that actually makes contact with the surface of the rail track) - of pitted, making the coach less stable while running.
Steel wheels that are not plated, as sold by Alan Gibson or Romford, retain the wheels rim smooth after months of running. On derailment etc of coaches, Alan Gibson/Romford fitted wheels, to me are much easier to put the coaches back on the rail track.
Unfortunately I find the locomotive fitted with the plated wheels suffer the same fate, and are not as easy to change over as compared to coaches and wagons.