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They were built between 1921 to 1930 and most of them continued in use through the 1940s and 1950's and unto to the late 1960's. These cars represent the cars that had their trucks replaced with cast steel trucks and modern brake equipment that had been carried out in the 1930's and 1940's.
I have no idea if the paint schemes on them are appropriate for my era of 1956.
Corn Sweeteners, that's a familiar name. I live about 15 miles from the big Corn Sweeteners plant in Cedar Rapids, IA. It used known as Waconia Sorghum when I was a kid.