SP&S an American Locomotive Company (ALCO) 'Century Series' diesel locomotives with a freight train on the Fort Wright trestle, undated. Photo by Robert Johnston.

SP&S an American Locomotive Company (ALCO) 'Century Series' diesel locomotives with a freight train on the Fort Wright trestle, undated. Photo by Robert Johnston.

A pair of SP&S EMD F3A diesel locomotives with a passenger train at Weather Bureau Rock, undated. Photo by Angelus Commercial Studios.

New Mid-Century Empire Builder inaugural eastbound run from Portland, Oregon, June 3, 1951, locomotive engineer Rudolph Wachter next to SP&S EMD diesel locomotive Number 750. Photo by Ackroyd Photo.

SP&S conductor, engineer and fireman comparing time of their watches by Class F3A Number 801, August 8, 1950.

SP&S diesel locomotive Number 22, an American Locomotive Company (ALCO) S-2, waits as 4-6-6-4 steam locomotive Number 910, Class Z-8, brings in a westbound freight at Wishram, Washington, undated. Photo by J. Mills.

SP&S 4-8-4 steam locomotive Number 702, Class E-1, and diesel locomotive Number 856, an American Locomotive Company (ALCO) FA-1 at east end of the enginehouse at Wishram, Washington, undated. Photo by J. Mills.

SP&S 4-6-6-4 steam locomotive Number 903, Class Z-6, and diesel locomotive Number 26, an American Locomotive Company (ALCO) S-2, on a snowy day in the yard at Wishram, Washington, undated. Photo by J. Mills.

SP&S 4-6-2 steam locomotive Number 626, Class H-1, with SP&S passenger Train Number 5 at the Pasco, Washington depot, along with Northern Pacific diesel locomotive Number 6503, an EMD F3A, with Northern Pacific passenger Train Number 5 on July 8, 1947. From the Phillip C. Johnson Collection.

SP&S freight train with 4-8-4 meeting SP&S diesel locomotive Number 801, an EMD F3A, on westbound passenger train at Skamania, Washington, September 24, 1955. John T. Labbe Photograph.