Northern Pacific 557, a GP7, leads the eastbound Auburn Local freight through Quendall, Washington, in 1952. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, trestle bridge.

Northern Pacific 5407, an Electro-Motive Division FT, hauls scheduled freight number 675 across the Stillaguamish River bridge north (railroad west) of Arlington, Washington, in 1955. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, truss bridge.

Northern Pacific 2502, a U25C, leads two sisters, 2505 and 2506 on eastbound freight number 600 across the viaduct at Sandpoint, Idaho, on April 15, 1965. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Northern Pacific 2502, a U25C, leads two sisters, 2505 and 2506 on eastbound freight number 600 across the viaduct at Sandpoint Idaho, on April 15, 1965. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Northern Pacific 250, a GP9, leads the eastbound Mobase Local over drawbridge 39 on the way to the South Tacoma hill on the 4th subdivision Prairie Line in Tacoma, Washington, on February 10, 1970. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, trestle bridge.

Northern Pacific GP9 and a FB Unit diesel leads scheduled freight number 931 across the high trestle at Wilburton, Washington, just south of Bellevue, on February 11, 1970. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, trestle bridge.

Northern Pacific construction train at Stampede Pass, Washington Territory, 1887. Decapod-type steam locomotive and flat cars paused on bridge number 18, groups of workers. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: work train, steam locomotive, railroad employee, bridge

Northern Pacific construction train at Stampede Pass, Washington Territory, 1887. Decapod-type steam locomotive and flat cars paused on bridge number 18, groups of workers. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: work train, steam locomotive, railroad employee, bridge

Northern Pacific bridges number 27 and 30 at Stampede Pass, Washington Territory, 1887. Timber trestles, three levels of switchback. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, mountains

Northern Pacific bridges number 24 and 26 at Stampede Pass, Washington Territory, 1887. Timber trestles, mainline, on switchback. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, mountains