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 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 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.

Southern Pacific Railroad diesel locomotive number 8618 at Redwood City, California on August 02, 1973. SP 8618 trails 9202 on a freight train at Redwood City in 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 8458 at Truckee, California on August 27, 1975. SP 8458, 8405 and 8470 help a westbound extra freight train west of Truckee in 1975. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, helper locomotive-.

Southern Pacific Railroad diesel locomotive number 4388 at Mt. Shasta, California in August 1977. SP 4388, 9054 and a third unit lead an extra freight train north of Mt. Shasta in 1977. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Southern Pacific Railroad diesel locomotive number 4000 at Redwood City, California on August 10, 1973. SP 4000 with caboose 1440 at Redwood City in 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, steel caboose.