Northern Pacific steam locomotive 5102 at the coal dock in Livingston, Montana, on May 28, 1954. Number 5102 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5102 at the coal dock in Livingston, Montana, on May 28, 1954. Number 5102 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5102 at the coal dock in Livingston, Montana, on May 28, 1954. Number 5102 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5101 at Missoula, Montana, on September 02, 1953. Number 5101 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5101 at Livingston, Montana, on May 29, 1954. Number 5101 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5101 at Livingston, Montana, on August 18, 1949. Number 5101 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5100 with a freight train, circa 1952. Number 5100 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5100 at Tacoma, Washington, on May 16, 1957. Number 5100, a class Z-6 built by Alco-Schenectady in 1936, is parked in the deadline at Tacoma. Photo by Emery Roberts, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, deadline

Northern Pacific steam locomotive 5100 at South Tacoma, Washington, on May 16, 1957. Number 5100 is a class Z-6 built by Alco-Schenectady in 1936. Photo by Emery Roberts, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 5100 at Schenectady, New York in 1936. Number 5100 is a class Z-6 built by Alco-Schenectady in 1936. Photo by AH Fiedler, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo