FWIW, Henning's has a track outside in front, it uses Atlas track. We've replaced the rollers several times on the engine that goes around and round on that for days on end.
I just sent out a repair for a museum that has O and STD gauge trains running, apparently all day. Besides replacing worn out wheels, we had to replace the pickups, some of them were worn all the way to the retaining shaft! Remember, that little pickup is spinning a LOT faster than the wheels!
