Found this link to this Rock Island-produced promotional film from about 1950. Lots of Rocket-scheme and red and black diesels, plus some steam. It's 19 minutes long. On the computer, sound is normal but video is jerky. Interesting nonetheless. Sadly, the film lasted a good deal longer than the railroad.

http://www.archive.org/movies/details-db.php?collection=prelinger&collectionid=37693
ryarger@rypn.org