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 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 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 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 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 2-8-0 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 2-8-0 steam locomotive Number 370, Class N-3, in a wreck east of Wishram, Washington, undated.

SP&S 2-8-0 steam locomotive Number 370, Class N-3, with a freight train at the Willbridge, Oregon depot, undated. From the Oregon Historical Society Collection.

SP&S 2-8-0 steam locomotive Number 364, Class N-3, with the yard transfer to Lake Yard in Portland undated.