Thanks to Bluenoser, I found a Pittsburgh schedule on the Radioinsight websight. While it's not one for mid summer in 1960, it's for a day in April of that year. I am satisfied to know that Swingshift Theater did come on after the Gateway Movie at about 1:15, and the station signed off after that. I always wondered, because the Swingshift Theatre that was on WDTV in the early fifties, went all night. Now I know. Thanks again Bluenoser!