I think some of these in the 1970's category may actually be from the 60's. The one that made me think that is the one really nice photo(my fav) of 478 in the great lighting. Behind it is 497. As I recall 497 did not operate in 1968(the last year), and was inside the roundhouse all year. Unless they pulled it out for some reason dead, I think this is before 1968. Anyone else care to venture on some of these!!!
The Rio Grande Southern stuff is a great little treasure to have color images of. I bet there are not 3 other people on this list that have shots they made on the RGS. It was long gone before my time!!!
Greg Scholl