Southern Pacific Railroad diesel locomotive number 9238 at Roseville, California on April 14, 1976. SP 9238, 9358 and 9004 with an eastbound extra freight train at Roseville in 1976. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 9197 at Sacramento, California on August 18, 1977. SP 9197 and 9381 lead a mixed freight train west of Sacramento in 1977. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 9186 at Redwood City, California on August 02, 1973. SP 9186 and another unit parked at Redwood City in 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive.

Southern Pacific Railroad diesel locomotive number 9119, circa 1975. SP 9119 leads a local freight. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 9061 at Truckee, California on August 27, 1975. SP 9061, 8968, 8368 and 8403 lead a westbound extra freight train west of Truckee in 1975. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 9061 at Donner Summit, California on August 27, 1975. SP 9061, 8968, 8368 and 8403 lead a westbound extra freight train at Donner Summit in 1975. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, tunnel.

Southern Pacific Railroad diesel locomotive number 9061 at Donner Summit, California on August 27, 1975. SP 9061, 8968, 8368 and 8403 lead a westbound extra freight train at Donner Summit in 1975. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, tunnel.

Southern Pacific Railroad diesel locomotive number 9009 at Kelso, Washington, circa 1975. SP 9009, 9015 and 9249 leads a freight train through Kelso. Photo by Jack Flagg, J.M. Fredricson collection. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 9009 at Kelso, Washington, circa 1975. SP 9009, 9015 and 9249 leads a freight train through Kelso. Photo by Jack Flagg, J.M. Fredricson collection. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 8983 at Benecia, California on June 27, 1974. SP 8983 and 9214 lead a freight consist of refrigerator cars at Benicia in 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, refrigerator car.