Northern Pacific 5003, a class Z-5, helps a westbound extra freight led by Northern Pacific 2681 up Bozeman Pass at Muir, Montana, in September 1953. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, helper locomotive, freight train.

Northern Pacific 5003, a class Z-5, waits at Muir, Montana after helping a train up Bozeman Pass before returning for its next assignment in September 1953. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, helper locomotive.

Northern Pacific steam locomotive 5003 on September 05 in 1953. Number 5003 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5004 at Livingston, Montana, on August 19, 1949. Number 5004 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5005 at Livingston, Montana, on May 23, 1952. Number 5005 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5005 at Livingston, Montana, on September 05, 1953. Number 5005 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5005 at Livingston, Montana, on September 05, 1953. Number 5005 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5005 at Livingston, Montana, on September 05, 1953. Number 5005 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5005 at Livingston, Montana, on June 08, 1955. Number 5005 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific 5005, a class Z-5, NP5121, a class Z-7, Northern Pacific 5006, a class Z-5, Northern Pacific 5100, the first class Z-6, Northern Pacific 5001, a class Z-5, Northern Pacific 1795 and 1770, both class W-3, wait at the shops in Livingston, Montana, for their next assignments on June 07, 1955. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, stored locomotive.