The film Ticket to Tomahawk - which has been difficult to find - is now on YouTube! The entire movie!
If you're not familar w/ this film, it's a goofy but fun western shot along the D&RG's Silverton Branch and a few parts of the RGS (bridge 160-A, and flatlands near Hesperus). Marilyn Monroe also made a very early apperance here - one of her first films I believe. She's uncredited, but is the yellow-dressed dancing girl, who appear about 30 minutes in.
The 'star' of the movie is RGS #20, along with one of the RGS cabooses - both dressed up rather gaudily. The film company needed the locomotive to be pulled along dirt roads, and - I think - actually attempted that with the real locomotive, which was far too heavy. They ended up building a very detailed wooden copy.
Today, the real #20 is ungoing a massive rebuild, while the wooden duplicate has been returned to Durango and is being put on display.