For long running display purposes, you have to compromise. At Children’s Hospital in St. Louis, we put on all metal wheels to try to control the black plastic dust of the wheels wearing. These trains run 365 days a year from 6 am to 9 pm. Worked great controlling the dust, but ate the profile out of the rails on the curves in less than a month and that left brass dust from the rail. Everything is compromise, we went back to plastic wheels. House cleaning now just dusts more often. 
I agree, metal wheels are the way to go for all the above reasons. Plastic wheels are good for gondola loads.
Ric Golding said:Ric, you just need to install stainless steel rails with the metal wheels. That should solve the problem. :P
For long running display purposes, you have to compromise. At Children's Hospital in St. Louis, we put on all metal wheels to try to control the black plastic dust of the wheels wearing. These trains run 365 days a year from 6 am to 9 pm. Worked great controlling the dust, but ate the profile out of the rails on the curves in less than a month and that left brass dust from the rail. Everything is compromise, we went back to plastic wheels. House cleaning now just dusts more often. ;-)
Yup, that’ll solve it fer sure. Eat the flanges off.
Okay, who is buying plastic wheels?
I use mine to build a pile at the maintenance facility on the layout!
They make nice gondola or flat loads too…
Ralph
Yep, And the longer the loads are hauled the flatter the wheels get!