Of course that is not a problem. What needs to be painted is the sides of the rail, the top - even if painted in the process - will return to lucid metal as so

Of course that is not a problem. What needs to be painted is the sides of the rail, the top - even if painted in the process - will return to lucid metal as soon as the next few trains pass on them. Usually small trucks (Unimogs adapted to rail use) or small convoys are used, see: https://scalaenne.wordpress.com/2016/07/30/binari-bianchi/ https://scalaenne.wordpress.com/2016/07/30/binari-bianchi/