Northern Pacific steam locomotive 4018 at Easton, Washington, on September 18, 1938. Number 4018 is a class Z-3 built by Alco-Brooks in 1917. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4016 at Easton, Washington, in 1944. Number 4016 is a class Z-3 built by Alco-Brooks in 1917. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific 4016 and two sister Class Z-3s wait for their next assignment at Easton, Washington, in 1944. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, locomotive facility.

Northern Pacific steam locomotive 4016 at Easton, Washington, on September 08, 1943. Number 4016 is a class Z-3 built by Alco-Brooks in 1917. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Two class Z-3 helpers, including number 4014, sandwich a wood caboose on the rear of an extra freight west at Easton, Washington, in 1943. This is the normal "one-in, one-on" helper configuration referring to one helper in the train and one on the rear of the train used on Stampede Pass. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, wood caboose.

Northern Pacific steam locomotive 4013 at Easton, Washington, in 1944. Number 4013 is a class Z-3 built by Alco-Schenectady in 1913. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4012 takes water at Easton, Washington, on April 08, 1943. Number 4012 is a class Z-3 built by Alco-Schenectady in 1913. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4010 next to the enginehouse at Easton, Washington, in 1944. Number 4010 is a class Z-3 built by Alco-Schenectady in 1913. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4010 waits to pick up its next train at Easton, Washington in 1944. Number 4010 is a class Z-3 built by Alco-Schenectady in 1913. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4009 at Easton, Washington, in 1944. Number 4009 is a class Z-3 built by Alco-Schenectady in 1913. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo