[roadkillrob]

Others have posted up similar issues, seems that they get iron bits stuck to the paint form the train ride that then rust and just need cleaned off. They may have sealed it, but doesn't look like they cleaned it well before they sealed - would need to have a clay bar used before the sealer to get all the deposits off the paint. Iron X or similar will remove it or a clay bar, but either may remove the sealer, so you may want to got back and have them clean it all and re-seal to do it correctly.