I painted the entire side, and, of course, it wasn't possible to avoid getting some paint on the top of the rail: as I noted, this will wipe off easily with a dry rag, if you don't wait too long to do the wiping.
Even though my layout is an around-the-room design, I painted the back (not normally visible) side of the rail, too. This helped to ensure that the paint colour that inevitably ends up on the ties is consistent right across the track: on the prototype, the area of the ties immediately below the rails often becomes discoloured with rust/dirt from the rails. As an added bonus, when I set the camera on the layout, facing towards the aisle, there are no shiny rails showing up in the photo. :thumb:
Wayne
Even though my layout is an around-the-room design, I painted the back (not normally visible) side of the rail, too. This helped to ensure that the paint colour that inevitably ends up on the ties is consistent right across the track: on the prototype, the area of the ties immediately below the rails often becomes discoloured with rust/dirt from the rails. As an added bonus, when I set the camera on the layout, facing towards the aisle, there are no shiny rails showing up in the photo. :thumb: Wayne