US Air Force B-52 simulator cars at Portland Union Station in 1962. Photograph by Alden Raney. Other subject classes: Car-B-52 Simulator.

URTX refrigerator car 871 at Bellingham, Washington, in or near the Great Northern yard. Other subject categories: Car-Freight, Car-Mechanical Reefer, Freight

URTX refrigerator car 832 at Bellingham, Washington, in or near the Great Northern yard. Other subject categories: Car-Freight, Car-Reefer, Freight

URTX refrigerator car 4754 at Bellingham, Washington, in or near the Great Northern yard. Other subject categories: Car-Freight, Car-Reefer, Freight

URTX refrigerator car 37238 at Bellingham, Washington, in Milwaukee Road lower yard; reefer URTX 89010 also visible; photograph sequence TRWahl0455-0454. Other subject categories: Car-Freight, Car-Mechanical Reefer, Freight, Yard-Freight

Burlington Northern Railroad freight train at Renton, Washington, on February 28, 1987. Eastbound train of freight cars led by diesel locomotive number 1812 on former Pacific Coast Railroad mainline down Houser Way. Photo by Robert W. Johnston. Other Subject Classes: freight cars, cabooses, railroad mainline.

Burlington Northern Railroad freight train at Renton, Washington, on February 28, 1987. Eastbound train of freight cars, caboose on former Pacific Coast Railroad mainline down Houser Way. Photo by Robert W. Johnston. Other Subject Classes: freight cars, cabooses, railroad mainline.

Union Pacific McCormick Terminal on Upper Harbor, Portland Oregon; ships in the upper harbor, Willamette River, undated. Photo by A. Prentiss.

Unknown steam powered train with pusher, at an unknown location. A David Emerson photo, undated.

Unidentified 4-4-0 steam locomotive number 67 with "Eastern" marking on the tender at a depot platform, circa 1890. Photo from J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, passenger train.