I have found more published photos. CCRM 1993 calendar, February shows Train order board on section house with a date of December 5 1967. CCRM 1991 calendar, May shows same with lenses removed dated May 28, 1968.Sundance RMRC 1980 back cover with San Juan at station. further examination of photo's shows two lenses one green and one red. the red was lit when horizontal and when blade was rotated down 45 degrees would line up with the hole in the other horizontal board, indicating that the red painted blade was for the approaching movement.
Al P.