SP&S 4-6-0 steam locomotive Number 157, Class D-3, departing with a passenger train from Portland, January 2, 1922, from the J.F. Adams 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.

SP&S 4-6-2 steam locomotive Number 621, Class H-1, at a station stop at Goodnoe, Washington in 1927.

SP&S 4-6-2 steam locomotive Number 621, Class H-1, arriving with passenger train Number One at Portland, May 7, 1939. Photo by Emery J. Roberts.

SP&S 4-6-2 steam locomotive Number 624, Class H-1, with a passenger train in Union Station; oiling around on Train Number 4, August 24, 1947.

SP&S 4-8-4 steam locomotive Number 700, Class E-1, with Train Number 4 on the Fort Wright trestle, July 21, 1950. Photo by Phillip C. Johnson.

SP&S 4-8-4 steam locomotive Number 701, Class E-1, with train Number 3 arriving at Portland Union Station, July 8, 1947.

SP&S 4-8-4 steam locomotive Number 702, Class E-1, with Train Number 2 on the Fort Wright trestle, May 2, 1941. Photo by Warren McGee.

SP&S 4-6-6-4 steam locomotive Number 902, Class Z-6, with a string of stock cars at the Kennewick, Washington depot, September 2, 1954.

SP&S 4-6-6-4 steam locomotive Number 902, Class Z-6, with a string of stock cars at the Kennewick, Washington depot, September 2, 1954.