SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, preparing for its maiden run at Portland, Oregon in October 1944.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, preparing for its maiden run at Portland, Oregon in October 1944.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, at Portland, Oregon. Photo by John E. Bender.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, at Yardley in Spokane, Washington getting ready to make its last run on June 22, 1956.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, working the Scribner Turn at Spokane, Washington.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, at the Northern Pacific Parkwater yard at Spokane, Washington. Photo by Gene Harsch.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, at Vancouver, Washington in April 1953. Photo by Stan Styles.

View of the front end of SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, retired at Vancouver, Washington on August 18, 1956. Photo by John Labbe.

View of front of SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, in storage at Vancouver, Washington on August 18, 1956. Photo by John Labbe.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, in storage at Vancouver, Washington on August 18, 1956. Photo by John Labbe.