Northern Pacific steam locomotive 43 at Auburn, Washington, on February 20, 1937. Number 43, a class Y built by Schenectady in 1898, is at the roundhouse. Photo by Emery Roberts, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roundhouse

Northern Pacific steam locomotive 45, circa 1910. Posed with her crew, Number 45, a class F-5 built by Schenectady in 1900, was obtained from the Seattle & International as their No. 11 and later converted to an 0-8-0 switcher. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, railroad crew, wood box car

Northern Pacific steam locomotive 4500 at Butte, Montana, on August 19, 1949. Number 4500 is a class Z-4 built by Alco-Richmond in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4500 at Butte, Montana, on August 19, 1949. Number 4500 is a class Z-4 built by Alco-Richmond in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4501 at Butte, Montana, on August 19, 1949. Number 4501 is a class Z-4 built by Alco-Richmond in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4501 at Butte, Montana, on August 19, 1949. Number 4501 is a class Z-4 built by Alco-Richmond in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4501 at Helena, Montana, in September 1953. Number 4501 is a class Z-4 built by Alco-Richmond in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

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

Northern Pacific steam locomotive 46 circa 1910. Posed with her crew, Number 46, a class F-5 built by Schenectady in 1900, was obtained from the Seattle & International as their No. 12. Later converted to an 0-8-0 switcher. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 46 poses for a roster photo on July 08, 1916. Number 46, a class F-5 built by Schenectady in 1900, after conversion to an 0-8-0 switcher, poses next to a white canvas during its company photo. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo