I used Evaporust to clean Lionel O-gauge tubular track - with a great result. 20-20 hindsight -- remove the track pins before soaking the track sections; so the product can remove rust and crud that tends to creep into the rail ends. Afterwards, insert a pipe cleaner soaked in Isopropyl Alcohol in the rail ends to remove hidden grime and assure a good electrical connection when the track pins are re-inserted. As others have mentioned, Evaporust will also remove the black paint from Lionel crossties.
Tip to hobbyists who like the look of shiny black crossties -- buy new track instead of cleaning old track with Evaporust.
Mike Mottler LCCA 12304