SP&S 4-6-2 steam locomotive Number 621, Class H-1, with the Portland roundhouse workforce after locomotive was rebuilt from SP&S 4-6-0 Number 107, December 2, 1927.

SP&S 4-6-6-4 steam locomotive Number 911, Class Z-6, with a westbound freight train at Marshall, Washington, May 17, 1953. Photo by Ron V. Nixon.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, with a freight train at Spokane, Washington, undated.

A view of SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, with the Scribner Turn at Scribner Junction, Washington and SP&S an American Locomotive Company (ALCO) RS-3 Number 65, circa 1952. Photo by Gene Harsch.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, with the Scribner Turn, waiting for signal at Scribner Junction, Washington, circa 1952. Photo by Gene Harsch.

SP&S 4-6-6-4 steam locomotive Number 905, Class Z-6, backing to a train at Wishram, Washington on October 9, 1951. Photo by John Labbe.

SP&S 4-6-6-4 steam locomotive Number 905, Class Z-6, on the west end of the Wishram engine house track, October 9, 1951. Photo by John Labbe.

SP&S 4-6-6-4 steam locomotive Number 905, Class Z-6, arriving with a freight train at Pasco, Washington on June 1, 1941.

SP&S 4-6-6-4 steam locomotive Number 904, Class Z-6, with a freight train at Camas, Washington, undated.

SP&S 4-6-6-4 steam locomotive Number 903, Class Z-6, and an American Locomotive Company (ALCO) FB diesel power at the east end of the Wishram, Washington enginehouse, undated.