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

Northern Pacific steam locomotive 5002 while in helper service at Bozeman, Montana, circa 1952. Number 5002 is a class Z-5 built by Baldwin in 1930. Photo by Ron V. Nixon, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5001 in the deadline at Livingston, Montana, on June 08, 1955. Number 5001 is a class Z-5 built by Baldwin in 1930. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

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.

Northern Pacific steam locomotive 5001 in the deadline at Livingston, Montana, on June 08, 1955. Number 5001 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 5001 in the deadline at Livingston, Montana, on June 08, 1955. Number 5001 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 5001 in front of the passenger depot while in helper service at Livingston, Montana circa 1952. Number 5001 is a class Z-5 built by Baldwin in 1930. Photo by Ron V. Nixon, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific class Z-5 number 5000 hauls a freight train at track speed on the Yellowstone Division circa 1938. Photo by Ed Overlie, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, freight train.

Northern Pacific steam locomotive 4502 at Livingston, Montana, on August 23, 1943. Number 4502 is a class Z-4 built by Alco-Richmond in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo