Northern Pacific steam locomotive 4025 picks up orders at New Stampede, Washington, circa 1925. The Z-3 Mallet was built by the American Locomotive Company in Dunkirk, New York, in 1920, and scrapped in South Tacoma, Washington, in 1958. Photo by J.A. Turner. Other Subject Classes: steam locomotive, semaphore signal

Helper Northern Pacific locomotive number 4025 picks up a staff and respirator at Stampede, Washington, to proceed through Tunnel 4 and then Tunnel 3, the Stampede Tunnel, circa 1925. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, telegraph station, railroad crew.

Northern Pacific 4025, a class Z-3, works steam on an eastbound extra freight near Saltese, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.

Northern Pacific steam locomotive 4025 at Saltese, Montana, on May 28, 1952. Number 4025 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight on the Milwaukee mainline between Haugan and Saint Regis, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, river.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight across a short bridge on the Milwaukee mainline between Haugan and Saint Regis, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, plate girder bridge.

Northern Pacific 4025, a class Z-3, approaches Saint Regis, Montana, with an eastbound extra freight on the Milwaukee mainline on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight through Mullan, Idaho, east of Wallace, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.

Northern Pacific steam locomotive 4025 at Missoula, Montana, on June 08, 1955. Number 4025 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific 4025, a class Z-3, hauls an eastbound extra freight up the 4 percent grade and reaches the summit of Lookout Pass, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight downhill after reaching the summit of Lookout Pass, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight on the Milwaukee mainline between Haugan and Saint Regis, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, river.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight on the Milwaukee mainline between Haugan and Saint Regis, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, river.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight downhill from the summit of Lookout Pass west of Haugan, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, river.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight downhill from the summit of Lookout Pass west of Haugan, Montana, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, river.

Northern Pacific steam locomotive 4025 at Garrison, Montana, on May 28, 1952. Number 4025 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight across a trestle near Dorsey, Idaho, east of Wallace, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, trestle bridge.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight across the high bridge at Dorsey, Idaho, east of Wallace, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, trestle bridge.

Northern Pacific steam locomotive 4025 on its final trip to South Tacoma has a brief stopover at Arlee, Montana, to cool a bad bearing on January 9, 1958. Number 4025 is a class Z-3 built by Alco-Brooks in 1920. Photo by Ron V. Nixon, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4025. Number 4025 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4024 at Tacoma, Washington, on May 29, 1934. Number 4024, a class Z-3 built by Alco-Brooks in 1920, is parked near the roundhouse after release from the shops. She entered the shops on 1/20/1934. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4024 at the engine facility at Tacoma, Washington, on May 29, 1934. Number 4024 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4024 at Easton, Washington, on April 09, 1943. Number 4024 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4024 at Easton, Washington, on April 09, 1943. Number 4024 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4023 posed for company roster photo in 1916. Number 4023 is a class Z-3 built by Alco-Brooks in 1920. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4023 at Easton, Washington, on April 09, 1943. Number 4023 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4021 at South Tacoma, Washington, on March 04, 1938. Number 4021, a class Z-3 built by Alco-Brooks in 1920, awaits its turn in the South Tacoma shops. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4021 at Missoula, Montana, on June 08, 1955. Number 4021 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4021 at Missoula, Montana, on June 08, 1955. Number 4021 is a class Z-3 built by Alco-Brooks in 1920 J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4021 at Missoula, Montana, on June 08, 1955. Number 4021 is a class Z-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo