Northern Pacific 59-foot, steel wood chip car number 582599 on a siding at Priest River, Idaho, on September 11, 1990. The car is part of the 582500-582649 number series. Photo by GJ Werkema. Other subject classes: freight car, steel wood-chip car

Northern Pacific 59-foot, steel wood chip car number 582517 on a siding at Priest River, Idaho, on September 11, 1990. The car is part of the 582500-582649 number series. Photo by GJ Werkema. Other subject classes: freight car, steel wood-chip car

Northern Pacific 60-foot, steel wood chip car number 119853 on a siding at Priest River, Idaho, on September 11, 1990. The car is part of the 119700-119999 number series. Photo by GJ Werkema. Other subject classes: freight car, steel wood-chip car

Northern Pacific bridge and tunnel at Grangeville, Idaho, circa 1910. Colorized postcard view of timber truss bridge, timber tunnel mouth, steam locomotive emerging. J.M. Fredrickson collection. Other Subject Classes: tunnel, bridge, steam locomotive

Northern Pacific steam locomotive 93 at Wallace, Idaho, on September 23, 1916. Number 93 is a class F-4 built by Grant in 1887. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight through Mullan, Idaho, east of Wallace, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight across a trestle near Dorsey, Idaho, east of Wallace, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, trestle bridge.

Northern Pacific 4025, a class Z-3, leads an eastbound extra freight across the high bridge at Dorsey, Idaho, east of Wallace, on May 28, 1952. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, trestle bridge.

Northern Pacific steam locomotive 3101 at Wallace, Idaho, on September 25, 1916. Number 3101 is a class Z-1 built by Baldwin in 1910. Photo by Charles R. Iles, J.M. Fredrickson collection. Other Subject Classes: steam locomotive, roster photo

Northern Pacific steam locomotive 244 at Lewiston, Idaho, on June 15, 1947. The engineer of Number 244, a class P-2 built by Schenectady in 1901, looks back as he prepares to leave. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, railroad crew