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, westbound in a meet with a passenger local near Cliffs, Washington, May 5, 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.

Wrecked SP&S 4-6-6-4 steam locomotive Number 900, Class Z-6, rerailed at Yellepit, Washington, August 1942.

Wrecked SP&S 4-6-6-4 steam locomotive Number 900, Class Z-6, being lifted by wrecking cranes at Yellepit, Washington, August 1942.

With cylinder cocks open SP&S 4-6-6-4 steam locomotive Number 900, Class Z-6, gets a westbound train started at Wishram, Washington, undated. Photo by W.C. Johnston.

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 4-8-4 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 701, Class E-1, with westbound freight train near Big Island (?), Washington circa 1950.