Northern Pacific steam locomotive 21 at Billings, Montana, on August 17, 1949. Number 21, a class Y-1 built by Schenectady in 1900, is shown with a cut of cars in the yard. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight yard, railroad crew

Northern Pacific steam locomotive 21 at Billings, Montana, on September 04, 1953. Number 21, a class Y-1 built by Schenectady in 1900, awaits its next switching assignment behind the steam lines near the roundhouse with sister number 20. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 26 at Billings, Montana, on September 04, 1953. The engineer of Number 26, a class Y-1 built by Schenectady in 1899, poses the engine with rods down at the freight yard. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 27 at Billings, Montana, on May 14, 1938. The crew of Number 27, a class Y-1 built by Schenectady in 1899, pose in the freight yard at Billings. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, freight yard, railroad crew

Northern Pacific steam locomotive 27 at Billings, Montana, on August 17, 1949. Number 27, a class Y-1 built by Schenectady in 1899, awaits the next assignment. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 27 at Billings, Montana, on August 17, 1949. Number 27, a class Y-1 built by Schenectady in 1899, switches a cut of cars. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight yard, railroad crew

Northern Pacific steam locomotive 34 at Billings, Montana, on September 04, 1953. Number 34, a class Y built by Schenectady in 1898, is parked at the Billings switcher track. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, roster photo