Fort Worth and Denver Railway diesel locomotive 608 sits under a highway overpass in Amarillo, Texas on June 21, 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Fort Worth and Denver Railway diesel locomotive 609 switching at Amarillo, Texas in 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Fort Worth and Denver Railway diesel locomotive 609 switching at Amarillo, Texas in 1978. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Four Southern Pacific Railroad diesel locomotives lead an extra freight train east of Lovelock, Nevada on August 24, 1977. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Four Southern Pacific Railroad diesel locomotives lead an extra freight train between Lovelock and Winnemucca, Nevada on August 24, 1977. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

General Motors demonstrator train, the Train of Tomorrow, running as Northern Pacific Passenger Extra GM 765 West, passes the station at Lakeview, Washington, on December 07, 1947. Train conductor receives train orders from telegraph operator. Concept demonstrator train consists of new Electro-Motive Division 2000-hp model E7 diesel locomotive number 765 and vista-dome coach, dining car, sleeping car, and parlor-observation car. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, diesel locomotive, passenger car, station, train order signal, railroad crew

General Motors demonstrator train, the Train of Tomorrow, running as Northern Pacific Passenger Extra GM 765 West, exits side track at Lakeview, Washington, on December 07, 1947. Concept demonstrator train consists of new model E7 diesel locomotive and vista-dome coach, dining car, sleeping car, and parlor-observation car. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, diesel locomotive, passenger car

General Motors concept demonstrator train, Train of Tomorrow, readies for display at the Occidental Avenue team track in Seattle, Washington, on December 9, 1947. Concept demonstrator train consists of new Electro-Motive Division 2000-hp model E7 diesel locomotive number 765 and vista-dome coach, dining car, sleeping car, and parlor-observation car. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, diesel locomotive, passenger car, railroad yard

General Motors concept demonstrator train, Train of Tomorrow, on display at the Occidental Avenue team track in Seattle, Washington, on December 9, 1947. People line up to view concept demonstrator train consisting of new Electro-Motive Division 2000-hp model E7 diesel locomotive number 765 and vista-dome coach, dining car, sleeping car, and parlor-observation car. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, diesel locomotive, passenger car, people, railroad yard

General Motors concept demonstrator train, Aerotrain, running as a Northern Pacific extra, southbound along the waterfront near Half Moon yard in Tacoma, Washington, circa 1955. Electro-Motive Division 1200-hp diesel locomotive leads nine passenger cars. Photo by J.M. Fredrickson. Other Subject Classes: passenger train, diesel locomotive, passenger car, railroad yard