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

Spokane, Portland & Seattle Railway steam locomotive number 700 at Bozeman, Montana, in October 2002. SP&S 700 clears water from its cylinders as it starts from Bozeman on its way to Missoula, Montana, with the westbound Montana Rockies Rail Tours excursion in October 2002. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger train.