As I've seen with many others on this site, there is a way to edit, create repaints, etc, etc. My question is how? Is there an editor or something I need to download, is there something I missed? I read all four manuals and have found nothing that I'm looking for. I ask because I wish to repaint a few locomotives and figure out later how to build them and import them into the game itself. Any information would be appreciated.

Thank you.