SP&S diesel locomotive Number 50, an American Locomotive Company (ALCO) RS-1, with a caboose at Portland, September 1955. John T. Labbe photograph.

Burlington Northern diesel locomotive Number 4362, Alco C-636 (former SP&S 332), with an eastbound freight train at Eavan, Washington, April 1970. From the Warren Wing Collection.

SP&S diesel locomotive Number 340, an American Locomotive Company (ALCO) C-636, with a westbound Burlington Northern freight train at Avery, Washington, undated. Photo by Robert. Johnston.

Front view of SP&S diesel locomotive Number 333, an American Locomotive Company (ALCO) C-636, with an eastbound Burlington Northern freight train at Avery, Washington, April 1970. Photo by Robert Johnston.

SP&S diesel locomotive Number 331, an American Locomotive Company (ALCO) C-636, with a freight train near Plymouth, Washington, April 22, 1968. Photo by Frank Seufert.

SP&S diesel locomotive Number 33, Baldwin VO-1000 with the Portland Yard drag, undated.

SP&S diesel locomotive Number 325, an American Locomotive Company (ALCO) C-425, with a westbound freight train at Fort Wright in Spokane, Washington, November 1969. Photo by Robert Johnston.

SP&S diesel locomotive Number 322, an American Locomotive Company (ALCO) C-425, on the first trip over new track made necessary due to the construction of the John Day Dam, May 1967. Photo by J. Vincent.

SP&S diesel locomotive Number 321 and 327, both American Locomotive Company (ALCO) C-425's, with long freight train along the Willamette River in Oregon, undated.

Burlington Northern diesel locomotive Number 317 (formerly SP&S), Alco C-425, in front of the Wishram depot with a freight train, April 1970. Photo by Robert Johnston.