The following pictures are from my friends at RailPictures.Net and depict the types of F series diesel locomotives manufactured by the Electro-Motive Division of General Motors used on the "Superchief" trains.
1953 Barstow, California
1964 Dearborn Station Chicago, Illinois
1967 Chicago, Illinois
1968 Stockton Depot, Stockton, California
1970 Belen, New Mexico
1973 ATSF Depot, San Diego, California