Northern Pacific steam locomotive 5121 at the coal dock in Helena in Montana, 1952. Number 5121 is a class Z-7 built by Alco-Schenectady in 1941. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5006 at Helena, Montana, in September 1953. Number 5006 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 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 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 31 at Helena, Montana, on June 06, 1955. Number 31, a class Y built by Schenectady in 1898, poses with rods down near the passenger depot. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger car

Northern Pacific steam locomotive 23 at Helena, Montana, on September 15, 1953. Number 23, a class Y-1 built by Schenectady in 1899, awaits its next switching assignment at the roundhouse. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, water column

Northern Pacific steam locomotive 23 at Helena, Montana, on May 24, 1952. Number 23, a class Y-1 built by Schenectady in 1899, backs by the depot. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, passenger depot

Northern Pacific steam locomotive 1856 at Helena, Montana, on September 15, 1952. Number 1856 is a class W-5 built by Alco-Schenectady in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 1856 at Helena, Montana, on September 15, 1952. Number 1856 is a class W-5 built by Alco-Schenectady in 1923. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo