Northern Pacific steam locomotive 5110 at Missoula, Montana, on August 20, 1943. Number 5110 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 5110, a class Z-6, Northern Pacific 5010, a class Z-5, and Northern Pacific 1728, a class W-3, are partially dismantled and await their fate on the rip track at the shops in Livingston, Montana, on June 07, 1955. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, stored locomotive.

Northern Pacific steam locomotive 5110 at Livingston, Montana, on May 23, 1952. Number 5110 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 5109 at Livingston, Montana, on September 06, 1953. Number 5109 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 5109 at Laurel, Montana, on May 21, 1954. Number 5109 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 5107 at Livingston, Montana, in September 1953. Number 5107 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 5107 in the deadline at Livingston, Montana, circa 1955. Number 5107 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 5107 in the deadline at Livingston, Montana, circa 1955. Number 5107 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 5107 in the deadline at Livingston, Montana, circa 1955. Number 5107 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 5107 at Laurel, Montana, on September 04, 1953. Number 5107 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo