SP&S 2-8-2 steam locomotive Number 538, Class O-3, from the firemans side at Pasco, Washington.

SP&S 2-8-2 steam locomotive Number 537, Class O-3, engineers side view at Vancouver, Washington.

SP&S 2-8-2 steam locomotive Number 537, Class O-3, engineers side view at Vancouver, Washington in April 1953. This locomotive was formerly Northern Pacific Number 1723 and was built by the Brooks Locomotive Works in March 1913. Photo by Stan Styles.

SP&S 2-8-2 steam locomotive Number 536, Class O-3, is seen doing some switching at Washtucna, Washington in 1953.

SP&S 2-8-2 steam locomotive Number 536, Class O-3, at Vancouver, Washington in September 1955. Photo by Stan Styles.

SP&S 2-8-2 steam locomotive Number 536, Class O-3, at Portland, Oregon on September 9, 1944. This locomotive was formerly Northern Pacific Number 1726 and was built by Brooks Locomotive Works in April 1913. Note the wartime blackout hood on the headlight. From the Witbeck Studio Collection.

SP&S 2-8-2 steam locomotive Number 535, Class O-3, does some switching near Stevenson, Washington on October 9, 1951. This locomotive was formerly Northern Pacific Number 1701 and was built by Brooks Locomotive Works in March 1913. Photo by John Labbe.

SP&S 2-8-2 steam locomotive Number 534, Class O-3, heads a freight out at an unknown location and date. This locomotive was formerly Northern Pacific Number 1747 and was built by Brooks Locomotive Works in April 1913.

SP&S 2-8-2 steam locomotive Number 533, Class O-3, at Vancouver, Washington in September 1953.

SP&S 2-8-2 steam locomotive Number 533, Class O-3, on the ready track at Portland, Oregon. This locomotive was formerly Northern Pacific Number 1744 and was built by Brooks Locomotive Works in April 1913. Photo by Herbert L. Arey.