SP&S 4-6-0 steam locomotive Number 160 (Class D-7), and 2-8-0's Number 301 (Class N-4), 305 (Class N-4), 336 (Class N-7) and other power on roundhouse tracks, 1932. Photo by H. Arey.

SP&S 4-4-2 steam locomotive Number 602, Class C-1, with Northern Pacific Number 79 and Great Northern Numbers 1624 and 1010 by the turntable, 1924. Photo by R. Hart.

SP&S, Northern Pacific and Northern Pacific Terminal Company steam locomotives at Hoyt Street roundhouse facilities in Portland, Oregon on October 26, 1919, from the Oregon Historical Society Collection.

SP&S turntable and roundhouse; aerial view of turntable, Hoyt Street Roundhouse at Portland, undated.

A view taken from a passenger car on an SP&S passenger train in Lake Yard in Portland, Oregon; undated.

A view of the Willamette River bridges, undated. This is a postcard image.

View of the Oregon Pony steam locomotive on display in front of Portland Union Station in 1962. Photograph by Alden Raney. Other subject classes: Locomotive-Steam.

Photographs of urban rail public transportation that generally has a lower capacity and lower speed than heavy rail systems.

Photographs of urban rail public transportation that generally has a lower capacity and lower speed than heavy rail systems.

Photographs of urban rail public transportation that generally has a lower capacity and lower speed than heavy rail systems.