Actually the locomotive in the second clip which was filmed on the Georgetown Loop is Westside #8. It was lettered "Argentine & Grays Peak" for a while. The Argentine & Grays Peak was one of the names under which the "Argentine Central" operated. The Argentine Central terminal was in Silver Plume Colorado. It ran from there to the mines at Waldorf, and on to the summit of Mt. McClellan. As I recall the segment from Waldorf to the summit had no purpose other than tourism, making it one of the first strictly tourist railroads in Colorado.
John Bush