Ear Mark this as classic Railwire thread drift. LOL
Heh heh.

Don't blame me. Or rather, I'm not feeling guilty about it at all. Truth be told, from what I knew of SP and subsidiaries, I had a hunch this topic was going to run-out very quickly from lack of material. There are three biggies - first, Cotton Belt was one of the earliest Class I's to axe passenger service. It was down to just the Morning Star around 1952 or so, and it was gone in '59. This is part of the second problem, color photography in the '50s was primarily in the professional and studio domains. I had an acquaintance who shot Kodachrome (ASA 1) in that era, and about all he could manage was Southwest desert images taken at noon. Santa Fe warbonnet red really popped in his slides, but other than that it was difficult, and expensive, to shoot rail action in color.
And then there's the third problem - SSW's operating region was not and still is not exactly known for its railfan population. "Whatcha matta' wid you, boy? Don't'cha like
girls? Or
football, for chrissakes?" Like a lot of Deep South rail images, I would hazard a bet that what photography there is was from guys passing through, or the handful of known images from the St. Louis area.
Speaking of "passing through", the
Barriger collection has early Cotton Belt images, but all in B&W, and none in the era you were looking for. It's a difficult subject.
