It will mess with the clear coat only if you don't use lube. You may benefit from it, maybe not. It depends on how many contaminents are in the paint. There could be a lot of rail dust in it.
Take a cellophane wrapper around your hand, and lightly rub your paint (when it's clean). If you feel a lot of bumps, you would probably want to claybar. If not...then I personally wouldn't worry about it.