A very specific photo search (498 in Antonito)

Greetings, I am seeking out a very specific photograph here. There was picture taken of 498 taking water in Antonito in the late 1960s. Included in this picture is a group of young kids standing around marveling at the engine. Supposedly, this picture was also used for a cover shot for one of the Sundance Publications Rocky Mountain Railroads Calender in the 1980s, but I have been unsuccessful in tracking down which year. I had thought for sure Ernie Robart took the picture, but after scanning the Friends archives, he took a near identical picture, sans the kids, seen here.
498 at Antonito Tank

This leaves me to ask, does anyone here know who took the picture in mind, and how I may be able to obtain a copy or print of the said picture?

Thank you,
-DRGW489