Northern Pacific steam locomotive 5112 at Missoula, Montana, on August 20, 1949. Number 5112, a class Z-6 built by Alco-Schenectady in 1937, is on the turntable at the roundhouse. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, turntable

Northern Pacific steam locomotive 5112 at Missoula, Montana, on August 20, 1949. Number 5112 is a class Z-6 built by Alco-Schenectady in 1937. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific steam locomotive 5111 at Easton, Washington, in August 1944. Number 5111 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 5111 at Easton, Washington, in August 1944. Number 5111 is a class Z-6 built by Alco-Schenectady in 1936. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive in roster photo

Northern Pacific 5110 leads an extra freight east through Wymer, Washington, while westbound Z-3, 4010, takes water on May 20, 1944. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, water column.

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 taking water while the fireman rests on the coal pile, circa 1952. 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 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