It's cheap enough, so you could buy a roll and see how it works on a little oval. I can see where this would be nice for the larger scale tracks with flat and wider rails and with the cars running braids. The way the rails stick up on HO track may be an issue. No clear answer for how to dress the 1/4" tape over the narrow HO rails. Do you leave a smooth ramp on either side of the rail or do you use a roller and get the copper to conform to the rail edges? Plus the HO shoes would probably wear down the thin copper fairly easily, especially magnet cars. Grinding down all your rails on plastic track sounds like way too much work.