Northern Pacific steam locomotive 2501 at Glendive, Montana, on April 25, 1950. Number 2501 is a class W-4 built by Alco-Brooks in 1906. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 2501 at Glendive, Montana, on April 25, 1950. Number 2501 is a class W-4 built by Alco-Brooks in 1906. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 2500 at Mandan, North Dakota, on April 26, 1950. Number 2500 is a class W-4 built by Alco-Brooks in 1906. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 25 at Butte, Montana, on May 09, 1958. Number 25, a class Y-1 built by Schenectady in 1899, is being moved into place on its display track at Butte. Photo by Ron V. Nixon, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, display

Northern Pacific steam locomotive 25 at Butte, Montana, on May 09, 1958. Number 25, a class Y-1 built by Schenectady in 1899, is being moved into place on its display track at Butte. Photo by Ron V. Nixon, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, display

Northern Pacific steam locomotive 249 at Tacoma, Washington, on December 04, 1937. Number 249, a class P-2 built by Schenectady in 1902, supplies house steam at the Tacoma roundhouse. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roundhouse

Northern Pacific steam locomotive 249 at Tacoma, Washington, on October 06, 1936. Number 249, a class P-2 built by Schenectady in 1902, gets is steam up after being rebuilt at the Tacoma roundhouse. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roundhouse, water column

Northern Pacific steam locomotive 249 at Tacoma, Washington, on October 18, 1936. Number 249, a class P-2 built by Schenectady in 1902, supplies house steam at the Tacoma roundhouse. Photo by Emery Roberts, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roundhouse

Northern Pacific steam locomotive 249 at Tacoma, Washington, on October 06, 1936. Number 249, a class P-2 built by Schenectady in 1902, is parked next to the roundhouse after being rebuilt. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roundhouse

Northern Pacific steam locomotive 249 at Tacoma, Washington, on October 06, 1936. Number 249, a class P-2 built by Schenectady in 1902, gets is steam up after being rebuilt at the Tacoma roundhouse. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roundhouse, water column