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 4011, circa 1919. Number 4011 is a class Z-3 built by Alco-Schenectady in 1913. J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4011, circa 1919. Number 4011 is a class Z-3 built by Alco-Schenectady in 1913. J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific 4011 waits in the siding at Thrall, Washington, with an extra freight west circa 1941. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.

Northern Pacific steam locomotive 4011 at Tacoma, Washington, on March 25, 1935. Number 4011, a class Z-3 built by Alco-Schenectady in 1913, is parked at the Tacoma roundhouse after release from the shops. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4011 emerges from Tunnel Number 4 at New Stampede, Washington, circa 1925. One crewman perches on the pilot of the Z-3 Mallet ready to throw the switch to the double track while another dangles a respirator from the fireman's window. Photo by J.A. Turner. Other Subject Classes: steam locomotive, tunnel

Northern Pacific steam locomotive 4011 pauses at Stampede, Washington, circa 1919 after pushing a train into the Stampede Tunnel. Number 4011 is a class Z-3 built by Alco-Schenectady in 1913. J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4011 and crew pose for a photo at Lester, Washington, circa 1912. Number 4011 is a class Z-3 built by Alco-Schenectady in 1913. J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Westbound Z-3, Northern Pacific 4010, takes water while an eastbound freight lead by 5110 passes at Wymer, Washington, on May 20, 1944. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, wood caboose.

Northern Pacific steam locomotive 4010 with a freight trains at Wymer, Washington, circa 1945. 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