Rare film clip of scrapped K28 *LINK*

Well I obtained another weird batch of 16mm film, along with some 8mm thats got 1950's foreign content(haven't watched that yet).
Have watched some 16mm, and one B&W reel is very interesting with some rare stuff. In the midst of seeing a wrecked UP 800 about to be towed by a Challenger, while the film shooter was riding behind another 800 somewhere, we see a brief clip of a Rio Grande NG passenger train backing up.
The scene is short, but I caught the fact it was engine 479 and the first car was a baggage car, followed I believe by an RPO, then a couple of coaches. Looks like it is backing to perhaps a station, as there is a building on the other side of the train but not identifiable.
There is another clip of film with some testing of a Pennsy K4 with smoke deflectors(something I had not seen before), and a camera shot mounted on the engine ahead of the stack. On the stack is chalked 8-15-39, as I would think that meant something as to shop work. Thus I ascertain this film was shot between September 1939 and early 42! Didn't the K28's go to Alaska in early 1942? Was this train the Shavano, and when was that train taken out of service.
Also seen in this film are two shots of SP Cab Forwards from a train, and some N&W in Virginia at places I recognized. So you see, some historical stuff can be found even this many years later! This made my day of course, and makes up for all those days editing and other mundane day to day junk in the business.
Anybody want to take a stab at the 479 clip?
Greg