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 steam locomotive 5000 advertisement. Number 5000 is a class Z-5 built by Alco-Schenectady in 1928 J.M. Fredrickson collection. Number 5000 is documented in a booklet titled "The Worlds' Largest Steam Locomotive," circa 1930. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5000 characteristices in an advertisement. Number 5000 is a class Z-5 built by Alco-Schenectady in 1928 J.M. Fredrickson collection. Number 5000 is documented in a booklet titled "The Worlds' Largest Steam Locomotive," circa 1930. 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 5000 from a company roster book in 1928. Number 5000 is a class Z-5 built by Alco-Schenectady in 1928. J.M. Fredrickson collection. Number 5000 is documented in a booklet titled "The Worlds' Largest Steam Locomotive". Other Subject Classes: steam locomotive, roster photo