I said I'd release this back when used it in Traingrid, but now I am finally getting to it since someone asked about it. It's just an edit of the original with empty skins available, plus my green one. (no sandwiches, that's mine)
The model files.
VMT/VTF for green skin with "Goldstein Rail Network" logo.
VMTs for the default red/blue skins.
PNG of gray skin with no logos, for customizing.
See the readme for further info.