Morrison Knudsen diesel demonstrator locomotive number 5401, of Alco parentage, at Balmer yard in Seattle, Washington, on February 2, 1971. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Morrison Knudsen diesel demonstrator locomotive number 5402, of Alco parentage, at Balmer yard in Seattle, Washington, on February 2, 1971. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive .

Morrison Knudsen 8301 at Union Pacific Railroad's Albina Yard. This was built as Electromotive Division type SD45X demonstrator 4203 and later became Southern Pacific Railroad 9503. Morrison Knudsen rebuilt it as a type SD40M-2 in 1982. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Morrison Knudsen 5001 at Portland Union Station with a transfer from Guilds Lake Yard. This was built as a Union Pacific type GP9 and rebuilt by Morrison Knudsen in 1982. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Morrison Knudsen 5001 at Portland Union Station with a transfer from Guilds Lake Yard. This was built as a Union Pacific type GP9 and rebuilt by Morrison Knudsen in 1982. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Builders plate from Morrison Knudsen on rebuilt Western Pacific type GP40 3502 at Hoyt Street Yard in Portland in 1981. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Modesto and Empire Traction Company General Electric (GE) 7-ton diesel switching locomotives number 606 and 604 parked at Modesto, California, on June 22, 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switching locomotive.

Modesto and Empire Traction Company General Electric (GE) 7-ton diesel switching locomotives number 602, 601, and 600 parked at Modesto, California, on June 22, 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switching locomotive, railroad crew

Modesto and Empire Traction Company General Electric (GE) 7-ton diesel switching locomotive number 602 parked at Modesto, California, on June 22, 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switching locomotive.

Modesto and Empire Traction Company General Electric (GE) 7-ton diesel switching locomotive number 606 parked at Modesto, California, on June 22, 1974. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switching locomotive.