Mark, I didn’t find much other than the following.
Another angle of the Morgan Street rack in Chicago. Photo by Russell Lee.
The Burlington used the Denver 23rd street tracks which had a rack through the C&S.
C&S 0-6-0 #580 eases into Union Station in 1951. Photo by Richard Steinheimer.
American Scale Models had these up in the brushes page... don’t know if identifiable...