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 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

Northern Pacific steam locomotive 36 at Missoula, Montana, on July 16, 1954. The engineer oils number 36 in the freight yard. Number 36 is a class Y built by Schenectady in 1898. Photo by Ron V. Nixon, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, railroad crew, freight yard

Northern Pacific steam locomotive 36 at Missoula, Montana, on August 24, 1943. The crew is boarding number 36, a class Y, which was built by Schenectady in 1898. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, railroad crew

Northern Pacific steam locomotive 33 at Missoula, Montana, on September 02, 1953. Number 33, a class Y built by Schenectady in 1898, takes a ride on the turntable. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, turntable, roundhouse

Northern Pacific steam locomotive 33 at Missoula, Montana, on September 02, 1953. Number 33, a class Y built by Schenectady in 1898, eases into stall 30 of the Missoula roundhouse. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roundhouse

Northern Pacific steam locomotive 32 at Missoula, Montana, on August 24, 1943. Number 32, a class Y built by Schenectady in 1898, is parked near the coal dock. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, 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