Good catch Kevin, the chains are surely "tourist" era. But did you notice the handrail on the other gon? Hopefully someone will educate us, but I thought the Rio Grande did use the short screen type spark arrestors in the dry seasons. Maybe they have been around so long in the tourist era, we assume they have always been there.
Curt got the C&TS logo and I'll fess up to removing the C&T that was visible on the frame. That was just too obvious and nowadays would have been repainted.
The tank has obviously been repainted and looks in much better condition that it did in 1968. Of course it could have looked like that after the Rio Grande B&B crew came through at any point in the past. If memory serves doesn't it have a much smaller tank (10,000 gallons?) or a liner inside now after a rebuild? Fiberglass maybe?
The caboose is lettered C&TS, but I didn't expect anyone to be able to see that in the small photo. The absence of the Rio Grande speed lettering would have to date the shot to either pre 1940, or as Greg caught, the C&TS.
As Earl noted this was the first day of JAC's 1992 charters. 26 years ago, yikes!