SP&S diesel locomotives Number 304 (an American Locomotive Company (ALCO) C-424), 310 (an American Locomotive Company (ALCO) C-425) and 302 (an American Locomotive Company (ALCO) C-424) along with with Northern Pacific Number 3604 (EMD SD45) on the engine tracks at Pasco, March 1969. Photo by Robert Johnston.

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 4-4-2 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 605, Class C-1, departing with passenger Train Number 5 at Pasco, Washington, April 30, 1945. Notice the wartime blackout hood on the headlight.

SP&S 4-4-2 steam locomotive Number 608, Class C-1, with passenger Train Number 4 leaving the Pasco, Washington depot, May 9, 1938. Photo by Al Farrow.

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 4-6-6-4 steam locomotive Number 901, Class Z-6, with an eastbound freight departing Pasco, Washington on May 9, 1938. Photo by Al Farrow.

SP&S 4-6-6-4 steam locomotive Number 901, Class Z-6, departing with a freight train from Pasco, Washington on May 9, 1938.

SP&S 4-6-6-4 steam locomotive Number 902, Class Z-6, leaving Pasco, Washington as Extra 902 West, September 2, 1954. Photo by Al Farrow.

SP&S 4-6-6-4 steam locomotive Number 903, Class Z-6, leaving Pasco, Washington with Train Number 275, March 21, 1939. This locomotive would later become Great Northern Number 4000. Photo by Al Farrow.