I lived and grew up with my parents backyard facing Airline Hwy Metairie Louisiana and Kansas City Southern track was right outside my parents backyard! I'm 59 years old so i got to see all of the old engines when they were in service including the F9 locomotives and man i miss those days! Locomotives back then had character unlike the ugly locomotives of today! The U boats and GP's and SD's were a common sight and even the old high hoods which i usually saw on the Central Ave tracks which was at the back of my parents neighborhood!
SEPX I'm guessing on those red-ended gondolas. Those used to go behind my house daily off Gregory Blvd in KC pulled by a trio of White SD40s/SD40-2s in the 80s headed South.