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 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, at Portland, Oregon. Photo by John E. Bender.

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.

The crew and management pose next to SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, at Portland, Oregon on October 16, 1944. Photo by Don Roberts.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, at Pasco, Washington on July 29, 1953.

SP&S 4-6-6-4 steam locomotive Number 910, Class Z-8, on a snowy day at Lamont, Washington.

SP&S 4-6-6-4 steam locomotive Number 905, Class Z-6, at the east end of the enginehouse at Wishram, Washington along with some ALCO FB diesel locomotives.