Denver & Rio Grande Western Railroad diesel locomotive 5484 with a passenger train in Colorado, circa 1968. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Denver & Rio Grande Western Railroad diesel locomotive 3117 at Provo, Utah on September 14, 1985. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Denver & Rio Grande Western Railroad diesel locomotive 3106 and 3079 with a freight train at Provo, Utah in 1985. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Delta Alaska Terminal Railroad diesel locomotive number 1 with a cut of cars at New Westminster, British Columbia on May 17, 1974. The locomotive was built by Baldwin. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Delta Alaska Terminal Railroad diesel locomotive number 1 with a cut of cars at New Westminster, British Columbia on May 17, 1974. The locomotive was built by Baldwin. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive

Curtis, Milburn and Eastern Railroad American Locomotive Company type C-415 684 at Burlington Northern Railroad's Hoyt Street Yard. This railroad was operated by Weyerhauser in 1980. Photograph by Alden Raney. Other subject classes: Locomotive-Diesel.

Curtis Millburn & Eastern Alco C-415 center cab diesel locomotive number 684 switches cars from the Weyerhaeuser property at Longview Junction, Washington, in July 1980. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight car, switching locomotive

Curtis Millburn & Eastern Alco C-415 center cab diesel locomotive number 684 switches cars from the Weyerhaeuser property at Longview Junction, Washington, in July 1980. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switching locomotive

Curtis Millburn & Eastern diesel locomotive number 684 at Chehalis, Washington, on February 12, 1976. Number 684, an Alco C-415 center cab switcher, parked with a Chehalis Western caboose and empty log flatcars. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive , wood caboose, log car, switching locomotive