I knew Mac Poor & Otto Perry, still hear from Dick Kindig now and then. All three of them were nice quiet fellows, always willing to answer historical questions, etc. Mac served as President of the RMRR Club in 1959 and Dick in 1960.
Otto & Dick used camera's that took post card size pix's, thus why you often see prints from them on post card stock. Dick also had a 35mm camera mounted on top of his large camera. By quick action, could get a b&w white pix, also a color slide.
Otto was a member of the RMRR Club, chased many trips and took pictures. Heard that He always bought a ticket, whether he rode the trip or not. In the years that I knew him, He worked for the Denver Post Office.