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

Northern Pacific steam locomotive 5003 at Livingston, Montana, on September 05, 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 5003 at Livingston, Montana, on September 05, 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 5002, a class Z-5, helps Northern Pacific 2681 move a westbound extra freight out of the yard at Livingston, Montana, toward Bozeman Pass in September 1953. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, helper locomotive, steel caboose.

Northern Pacific 5002, a class Z-5, helps Northern Pacific 5124 move a westbound extra freight out of the Livingston, Montana yard toward Bozeman Pass on May 23, 1952. Note track gang working on an adjacent track, Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, helper locomotive, steel caboose.

Northern Pacific steam locomotive 5002 in helper service at Livingston, Montana, on May 23, 1952. Number 5002 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo