SP&S EMD NW2 diesel locomotive Number 41 with ALCO S-1 Number 10 on the ready track at Portland, Oregon on April 11, 1952.

SP&S EMD NW2 diesel locomotive Number 40 on Hoyt Street Roundhouse track at Portland, Oregon on May 29, 1948. Photo by Don Roberts.

Color photograph of former SP&S ALCO C-636 diesel locomotives Number 340 and 335, now Burlington Northern, in a multiple unit lashup in the yard at Vancouver, Washington on March 8, 1970. Photo by F. Guernsey.

SP&S Baldwin VO-1000 diesel locomotive Number 34 on Hoyt Street Roundhouse track at Portland, Oregon.

SP&S Baldwin VO-1000 diesel locomotive Number 34 in Hoyt Street Roundhouse lineup at Portland, Oregon on September 1, 1962.

SP&S Baldwin VO-1000 diesel locomotive Number 34 in Hoyt Street Roundhouse lineup at Portland, Oregon in May 1946.

SP&S ALCO C-636 diesel locomotives Number 335 and 334 at the diesel shops at Vancouver, Washington.

Color photograph of SP&S ALCO C-636 diesel locomotives Number 333 and 343 in a multiple lashup.

SP&S ALCO C-636 diesel locomotive Number 332, one of the ALCO C-636 demonstrator units, and a Great Northern GP9 with a freight train leaving the yard at Vancouver, Washington probably on its way to Klamath Falls, Oregon.

SP&S ALCO C-636 diesel locomotives Number 330 and 331 along with an ALCO FA-1 with a freight train in the yard at Vancouver, Washington in August 1969.

SP&S Baldwin VO-1000 diesel locomotive Number 33 on shop track at Portland, Oregon.

SP&S ALCO C-425 diesel locomotives Number 326 and 316 at the Northern Pacific yard at Pasco, Washington in August 1967.

SP&S ALCO C-425 diesel locomotive Number 324 and C-424 Number 305 in a multiple lashup at the Northern Pacific yard at Pasco, Washington in August 1967. Photo by Stan Styles.

SP&S ALCO C-425 diesel locomotive Number 324 and C-424 Number 305 in a multiple lashup at the Northern Pacific yard at Pasco, Washington in August 1967. Photo by Stan Styles.

SP&S ALCO C-425 diesel locomotives Number 322 and 316 in a multiple unit lashup in the yard at Wishram, Washington in May 1968. Photo by Stan Styles.

SP&S Baldwin VO-1000 diesel locomotive Number 32 in the yard at 9th St in Portland, Oregon in May 1950.

SP&S ALCO C-425 diesel locomotive Number 316 in a multiple lashup in the yard possibly at Pasco, Washington.

SP&S ALCO C-425 diesel locomotives Number 315 and 326 on long freight train.

SP&S ALCO C-425 diesel locomotives Number 314 and 320 by sand tower.

SP&S ALCO C-425 diesel locomotives Number 313, 310 and 311 on a westbound freight at Spokane, Washington.

SP&S ALCO C-425 diesel locomotives Number 312 and 326 at the Northern Pacific yard at Pasco, Washington in August 1968.

SP&S ALCO C-425 diesel locomotive Number 311 and C-424 Number 300 at the Northern Pacific yard at Pasco, Washington in May 1968. Photo by Stan Styles.

SP&S ALCO C-425 Number 310 with C-424 Number 306 in the yard. Photo by Robert W. Johnston.

SP&S ALCO C-425 diesel locomotive Number 310 and C-424 Number 302 at the Northern Pacific yard at Pasco, Washington in March 1969.

SP&S Baldwin VO-1000 diesel locomotive Number 31 with a wartime headlight blackout hood at Vancouver, Washington.

SP&S Baldwin VO-1000 diesel locomotive Number 31 with a wartime headlight blackout hood at Vancouver, Washington.

SP&S Baldwin VO-1000 diesel locomotive Number 31 in the yard at Portland, Oregon.

SP&S ALCO C-424 diesel locomotive Number 305 and C-425 Number 324 at Northern Pacific yard at Pasco, Washington in August 1967.

SP&S ALCO C-424 diesel locomotive Number 304 and C-425 Number 324 at Vancouver, Washington. Photo by Robert Johnston.

SP&S ALCO C-424 diesel locomotive Number 304 at Vancouver, Washington in September 1969.