Early C&TS question

Yesterday while looking at some footage from old 16mm someone sent me, there was old D&RGW stuff, as well as some early C&TS material. I believe these were from one or two visits.
Interestingly there was trains hauled by 484 from Chama with a box car, behind the loco. They made a roundtrip to Cumbres, then the next day a trip to Big Horn, and a runbdy was made there.
In other footage, there was 483 sporting Rio Grande Southern STYLE C&TS lettering on the tender.
Later we see 487, which I believe is around 1975-76.
I never saw any photos of the 483 like this. My thinking is that this was around 1973-76.
Also in one shot there were 3-4 coaches under reconstruction from box cars to coaches, across from the Coaling tower as 484 departed one day.
Any guess on years for this stuff. Also there is a nice shot of the helper exiting the complete Snowshed at Cumbres.
Greg Scholl