Northern Pacific steam locomotive 5125 at Livingston, Montana, on June 08, 1955. Number 5125 is a class Z-7 built by Alco-Schenectady in 1941. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5125 at Livingston, Montana, on June 08, 1955. Number 5125 is a class Z-7 built by Alco-Schenectady in 1941. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5126 at Livingston, Montana, on August 23, 1943. Number 5126 is a class Z-7 built by Alco-Schenectady in 1941. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5130 at Missoula, Montana, on August 25, 1943. Number 5130 is a class Z-8 built by Alco-Schenectady in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5131 at Garrison, Montana, circa 1952. Number 5131 is a class Z-8 built by Alco-Schenectady in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5131 at Garrison, Montana, in 1952. Number 5131 is a class Z-8 built by Alco-Schenectady in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5131 at Livingston, Montana, on May 23, 1952. Number 5131 is a class Z-8 built by Alco-Schenectady in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5131 at Tacoma, Washington, on October 05, 1955. Number 5131 is a class Z-8 built by Alco-Schenectady in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5132 at Missoula, Montana, in August 1943. Number 5132 is a class Z-8 built by Alco-Schenectady in 1943. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific 5133, a class Z-8, pushes on caboose 1012 to move a freight out of the yard at Helena, Montana, in 1953. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, helper locomotive, steel caboose.