Northern Pacific steam locomotive 31 at Helena, Montana, on June 06, 1955. Number 31, a class Y built by Schenectady in 1898, poses with rods down near the passenger depot. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger car

Northern Pacific steam locomotive 29 at Butte, Montana, on August 19, 1949. Number 29 was built as a class Y-1 by Schenectady in 1899. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, wood box car, freight yard

Northern Pacific steam locomotive 29 at Butte, Montana, on August 19, 1949. Number 29 was built as a class Y-1 by Schenectady in 1899. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, wood box car, freight yard

Northern Pacific steam locomotive 28 at Butte, Montana, on August 16, 1949. Number 28, a class Y-1 built by Schenectady in 1899, switches a passenger consist. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger car, railroad crew

Northern Pacific steam locomotive 27 at Billings, Montana, on August 17, 1949. Number 27, a class Y-1 built by Schenectady in 1899, awaits the next assignment. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 27 at Billings, Montana, on August 17, 1949. Number 27, a class Y-1 built by Schenectady in 1899, switches a cut of cars. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight yard, railroad crew

Northern Pacific steam locomotive 27 at Billings, Montana, on May 14, 1938. The crew of Number 27, a class Y-1 built by Schenectady in 1899, pose in the freight yard at Billings. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, freight yard, railroad crew

Northern Pacific steam locomotive 2688 with its insulation and metal covering removed for inspection at Livingston, Montana, in September 1952. Number 2688 is a class A-5 built by Baldwin in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 2687 at Missoula, Montana, on September 02, 1953. Number 2687 is a class A-5 built by Baldwin in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 2683 at Livingston, Montana, on May 23, 1952. Number 2683 is a class A-5 built by Baldwin in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo