Northern Pacific steam locomotive 4005 at Auburn, Washington, in 1942. Number 4005 is a class Z-3 built by Alco-Schenectady in 1913. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4004 at Stampede, Washington, circa 1928. Number 4004 is a class Z-2 built by Baldwin in 1910. Photo by Alma Floberg, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4004 at Helena, Montana, circa 1920. Number 4004, a class Z-2 built by Baldwin in 1910, is posed with its crew. Photo by Keller, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4004 at Helena, Montana, circa 1920. Number 4004, a class Z-2 built by Baldwin in 1910, is posed with its crew. Photo by Keller, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4004 at Easton, Washington, circa 1928. Number 4004 is a class Z-2 built by Baldwin in 1910 J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4003 in helper service at Lester, Washington, circa 1915. Number 4003 is a class Z-2 built by Baldwin in 1910. Photo by Art Westborg, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4003 at Easton, Washington, circa 1915. Number 4003 is a class Z-2 built by Baldwin in 1910. Photo by GW Pilgrim, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4003 at Bozeman, Montana, on August 22, 1943. Number 4003 is a class Z-2 built by Baldwin in 1910. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4002 at Bozeman, Montana, on August 22, 1943. Number 4002 is a class Z-2 built by Baldwin in 1910. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4001 at Livingston, Montana, on August 22, 1943. Number 4001 is a class Z-2 built by Baldwin in 1910. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4000 on September 18, 1916. Number 4000 is a class Z-2 built by Baldwin in 1910. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 40, circa 1878. Number 40 (old number series) was built by Baldwin in 1872. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 40 at Mandan, North Dakota, on July 31, 1934. Number 40, a class Y built by Schenectady in 1898, is parked at the engine terminal at Mandan. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4 at Yacolt, Washington, circa 1910. Number 4, a Heisler, and number 7, a Lima Shay, are parked at Yacolt with other locomotives. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 4 at Erie, Pennsylvania in 1907. Number 4 is a class V-2 built by Heisler in 1907. Photo by Heisler, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 4 at Erie, Pennsylvania in 1907. Number 4 is a class V-2 built by Heisler in 1907. Photo by Heisler, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 391 on September 05, 1916. Number 391 is a class E built by Baldwin in 1882. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 39 poses for a roster photo on September 16, 1916. Number 39, a class Y built by Schenectady in 1898, is posed for its company photo. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 39 at Brainerd, Minnesota, on May 02, 1950. Number 39, a class Y built by Schenectady in 1898, sits in the deadline one month before she is to be scrapped. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, deadline

Northern Pacific steam locomotive 386 at Tacoma, Washington, on October 31, 1916. Number 386 is a class E-5 built by Schenectady in 1893. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 369 at Tacoma, Washington, on November 01, 1916. Number 369 is a class E-8 built by Baldwin in 1890. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 367, circa 1920. Number 367 is a class E-7 built by Cooke in 1892. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 367 in 1916. Number 367 is a class E-7 built by Cooke in 1892. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 366, circa 1898. Number 366 is a class E-7 built by Cooke in 1892. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 366 at Granite Falls, Washington, in 1909. Number 366 is a class E-7 built by Cooke in 1892. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 363 in 1916. Number 363 is a class E-1 built by Manchester in 1888. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 361, circa 1920. Number 361 is a class E-1 built by Manchester in 1888. J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 36 at Missoula, Montana, on July 16, 1954. The engineer oils number 36 in the freight yard. Number 36 is a class Y built by Schenectady in 1898. Photo by Ron V. Nixon, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, railroad crew, freight yard

Northern Pacific steam locomotive 36 at Missoula, Montana, on August 24, 1943. The crew is boarding number 36, a class Y, which was built by Schenectady in 1898. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, railroad crew

Northern Pacific steam locomotive 36 at Butte, Montana, on August 19, 1949. Number 36, a class Y built by Schenectady in 1898, poses with its rods down at the roundhouse. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roundhouse