Pacific & Idaho Northern Railway streetcar 100 with the baggage door open in Idaho, circa 1932. J.M. Fredrickson collection. Other Subject Classes: streetcar

Engine crews pose with two Oso Logging Company Climax locomotives out on the company line in Washington State, circa 1912. J.M. Fredrickson Collection. Other Subject Classes: steam locomotive, geared locomotive, railroad crew

Oriental Limited Passing Steamships Minnesota and Dakota at the Great Northern Dock, Smith Cove, Seattle, Washington in 1905, from the University of Washington Collection.

SP&S crane X-35 and wrecking crane X-5 working on rebuilding Oregon Trunk Railway Bridge T-149-6 at Bend, Oregon circa 1956.

SP&S crane X-35 and wrecking crane X-5 working on rebuilding Oregon Trunk Railway Bridge T-149-6 at Bend, Oregon circa 1956.

Oregon Railroad and Navigation Company, (OR&N) a subsidiary of the Union Pacific Railroad, Motor Car number 1 at Dayton, Washington, undated. Photo by Jerry Swart, J.M. Fredrickson collection. Other Subject Classes: motor car.

Oregon Portage Railway 0-4-0 steam locomotive "Oregon Pony" on display at Cascade Locks Historical Museum, Oregon, on July 10, 1967. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, display

Oregon Electric ALCO RS-1 diesel locomotive Number 55 at Portland, Oregon. Locomotive was later sold to the SP&S.

Leased Oregon Electric ALCO RS-1 diesel locomotive Number 55 at Portland, Oregon switching a coach on February 2, 1946. Locomotive later sold to the SP&S.