When modeling in HO I used a Centerline track cleaning car with "Goo Gone". Had good results. I run these modified m t h flat cars with a magic eraser trimmed to height. This train has six cars with erasers and I'll run it over the layout once about every other time I run and have never had to wipe down the track or have had contact problems. I also similarly did a Lionel traditional size Gondola for someone one time and it worked well.
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