Northern Pacific steam locomotive 1093 builds steam at Bozeman, Montana, circa 1946. Number 1093 is a class L-9 built by Alco-Dickson in 1907. Photo by Spear, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 1093 builds steam at Bozeman, Montana, circa 1946. Number 1093 is a class L-9 built by Alco-Dickson in 1907. Photo by Spear, J.M. Fredrickson collection. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 1815 at Bozeman, Montana, on August 23, 1943. Number 1815 is a class W-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 1828 at Bozeman, Montana, on August 22, 1943. Number 1828 is a class W-3 built by Alco-Brooks in 1920. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 2235 at Bozeman, Montana, on July 23, 1934. Number 2235, a class Q-5 built by Alco-Brooks in 1920, is parked while the crew "oils around." Photo by Herman Hunt, J.M. Fredrickson collection. 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 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 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