A Southern Pacific Railroad Commuter train leaves Redwood City, California on August 10, 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train.

A Southern Pacific Railroad Fairbanks-Morse unit with a Commuter train leaves Redwood City, California on August 10, 1973. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, passenger train.

Saint Maries River Railroad Electro-Motive Division (EMD) GP-9 diesel locomotive number 103 (former Milwaukee 322) parked at the engine facility in Saint Maries, Idaho, circa 1998. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Alaska Railroad diesel locomotive 1502 on display at Yakima, Washington, circa 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Alaska Railroad diesel locomotive 3017 at Hinkle, Oregon on October 9, 1986. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Alaska Railroad diesel locomotive 3017 at Hinkle, Oregon on October 9, 1986. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

American Locomotive Company (ALCO) diesel locomotives Number DL-701A, 701-B and 701-C in demonstration service on the SP&S at Wishram, Washington, undated. Photo by J. Mills.

American Smelting and Refining Company (ASARCO) number 52, a General Electric (GE) 44-ton diesel switching locomotive at the Tacoma Smelter at Tacoma, Washington, in October 1969. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive , switching locomotive.

American Smelting and Refining Company (ASARCO) diesel locomotive number 52 switching cars at the Tacoma Smelter at Tacoma, Washington, in October 1969. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switching locomotive.

American Smelting and Refining Company (ASARCO) diesel locomotive number 52 switching cars at the Tacoma Smelter at Tacoma, Washington, in October 1969. Photo by Al Harris, J.M. Fredrickson Collection. Other Subject Classes: diesel locomotive, switching locomotive.