Yreka Western Railroad Alco S4 diesel locomotive number 1172 (construction number 81393, built in 1955) parked with sister 1171 at the engine facility in Yreka, California, on June 16, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive , switching locomotive.

Yreka Western Railroad Alco S4 diesel locomotive number 1172 (construction number 81393, built in 1955) parked with sister 1171 at the engine facility in Yreka, California, on June 16, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive , switching locomotive.

Four Western Pacific Railroad diesel locomotives lead freight train 137 at Oroville, California, circa 1982. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Three Western Pacific Railroad diesel locomotive pass the caboose of a freight train at Keddie, California, circa 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Western Pacific Railroad diesel locomotive 917D at Sacramento, California on August 3, 1973.Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Western Pacific Railroad diesel locomotive 913-A at Sacramento, California on August 3, 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Western Pacific Railroad diesel locomotives 732 and 913-A at engine facility in Sacramento, California on August 3, 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Western Pacific Railroad diesel locomotive 713 leads a train at Oroville, California on June 22, 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Western Pacific Railroad diesel locomotive 701 at Sacramento, California on August 3, 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Western Pacific Railroad diesel locomotive 604 in California, circa 1982. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive