SP&S 2-8-0 steam locomotive Number 370, Class N-3, at station stop at Willbridge, Oregon with a freight train, undated, from the Don Roberts Collection.

SP&S 4-4-0 steam locomotive Number 50, Class L-1, with the Superintendent's business car at the Blind Slough, Oregon drawbridge, circa 1910.

SP&S 2-8-2 steam locomotive Number 539, Class O-3, leaving by the site of the old Northern Pacific Pasco, Washington depot, July 13, 1955. Photo by Al Farrow.

SP&S 2-8-2 steam locomotive Number 539, Class O-3, with a freight train at a crossing in Spokane, undated. Photo by Clyde Parent.

SP&S 4-4-2 Steam locomotive 601, Class C-1, with passenger Train Number 1 in Devil's Canyon, undated. Photo by the Kiser Photo Company.

SP&S 4-4-2 Steam locomotive 601, Class C-1, with passenger Train Number 1 in Devil's Canyon, undated. Photo by the Kiser Photo Company.

SP&S 4-4-2 steam locomotive Number 603, Class C-1, with Train Number 4 at North Dalles, Washington on July 4, 1938. Photo by Emery Roberts.

SP&S 4-4-2 steam locomotive Number 603, Class C-1, on Train Number 4 at Pasco, Washington, April 30, 1945. Photo by Al Farrow.

SP&S 4-4-2 steam locomotive Number 603, Class C-1, with local passenger train at Wishram, Washington on July 28, 1940. Photo by Otto Perry, Denver Public Library Collection..

SP&S 4-4-2 steam locomotive Number 603, Class C-1, with a passenger train in Union Station, 1939. Photo by Herbert L. Arey.