SP&S steam locomotive with a passenger train at Tunnel Number 2, 1916.

SP&S 4-6-6-4 steam locomotive, Class Z-6, with a westbound freight east of Home Valley, Washington, undated. Photo by Photo-Art Commercial Studio.

SP&S 4-6-6-4 steam locomotive, Class Z-6, with a westbound freight east of Home Valley, Washington, undated. Photo by Photo-Art Commercial Studio.

An SP&S 4-4-2 Class C-1 steam locomotive heads a passenger train near Cascades, Washington, 1909, Fred H. Kiser Photograph, from the Oregon Historical Society Collection.

An SP&S 4-4-2 Class C-1 steam locomotive heads a passenger train near Cascades, Washington, 1909, Fred H. Kiser Photograph. This is a postcard image.

An SP&S 4-4-2 Class C-1 steam locomotive heads a passenger train near Cascades, Washington, 1909, Fred H. Kiser Photograph. This is a postcard image.

An SP&S 4-4-2 Class C-1 steam locomotive heads a passenger train near Cascades, Washington, 1909, Fred H. Kiser Photograph.

An SP&S 4-4-2 Class C-1 steam locomotive heads a passenger train near Cascades, Washington, 1909, Fred H. Kiser Photograph, from the Oregon Historical Society Collection.

SP&S steam locomotive with a freight train, postmarked April 2, 1910. This is a postcard image.

SP&S 4-8-4 steam locomotive Number 702, Class E-1, involved in the wreck of Train Number 4 near Cliffs, Washington on September 28, 1947.