SP&S 2-8-2 steam locomotive Number 531, Class O-3, at Vancouver, Washington in April 1953. Photo by Stan Styles.

SP&S 2-8-2 steam locomotive Number 531, Class O-3, at Portland, Oregon. Photo by Herbert Arey.

SP&S 2-8-2 steam locomotive Number 531, Class O-3, at Portland, Oregon. Photo by Herbert Arey.

SP&S 2-8-2 steam locomotive Number 531, Class O-3, at Portland, Oregon. This locomotive was formerly Northern Pacific Number 1704 and was built by Brooks Locomotive Works in March 1913.

SP&S 2-8-2 steam locomotive Number 531, Class O-3, at Portland, Oregon on May 30, 1937. Photo by Herbert L. Arey.

SP&S 2-8-2 steam locomotive Number 531, Class O-3, at Pasco, Washington in October 1952.

SP&S 2-8-2 steam locomotive Number 530, Class O-3, at Vancouver, Washington. This locomotive was formerly Northern Pacific Number 1765 and was built by Brooks Locomotive Works in September 1917. Notice the wartime blackout hoods on the headlight and class lights.

SP&S 2-8-2 steam locomotive Number 530, Class O-3, at Vancouver, Washington.

SP&S 2-8-2 steam locomotive Number 530, Class O-3, at Vancouver, Washington in July 1950. By this time the locomotive has add engine number indicators installed.

SP&S 2-8-2 steam locomotive Number 530, Class O-3, with other steam locomotives out of service at Vancouver, Washington in April 1953.