Electro-Motive Division of General Motors diesel locomotive 4352, an SD-45 demonstrator unit, sits at the Northern Pacific diesel house in Auburn Washington before testing on Stampede Pass on April 28, 1966. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel locomotive 4353, an SD-45 demonstrator unit, sits at the Northern Pacific diesel house in Auburn Washington before testing on Stampede Pass on April 28, 1966. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel locomotive 4353, an SD-45 demonstrator unit, sits at the Northern Pacific diesel house in Auburn Washington before testing on Stampede Pass on April 28, 1966. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel locomotive 4353, an SD-45 demonstrator unit, sits at the Northern Pacific diesel house in Auburn Washington before testing on Stampede Pass on April 28, 1966. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel cab locomotive 462 at Auburn, Washington on April 29, 1973. EMD 462 and test car which accompanied EMD 5740 on its demo tour, is parked at Auburn diesel house. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel locomotive 5740 at diesel house in Auburn, Washington on April 29, 1973. EMD 5740, an SD45X is a 6-axle experimental diesel locomotive powered by an EMD 645E3A 20-cylinder engine which generated 4,200 horsepower. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel locomotive 5740 parked at the Auburn, Washington diesel house with an EMD test car and cab unit 462 at Auburn, Washington on April 29, 1973. EMD 5740, an SD45X is a 6-axle experimental diesel locomotive powered by an EMD 645E3A 20-cylinder engine which generated 4,200 horsepower. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel locomotive 5740 parked at the Auburn, Washington diesel house with an EMD test car and cab unit 462 at Auburn, Washington on April 29, 1973. EMD 5740, an SD45X is a 6-axle experimental diesel locomotive powered by an EMD 645E3A 20-cylinder engine which generated 4,200 horsepower. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Electro-Motive Division of General Motors diesel locomotive 5740 parked at the Auburn, Washington diesel house with an EMD test car and cab unit 462 at Auburn, Washington on April 29, 1973. EMD 5740, an SD45X is a 6-axle experimental diesel locomotive powered by an EMD 645E3A 20-cylinder engine which generated 4,200 horsepower. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive