Northern Pacific steam locomotive at Stampede Pass, Washington Territory, 1887. Decapod-type steam locomotive on construction train, box and flat cars, workers, on bridge number 15. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: steam locomotive, work train, freight car, railroad employee, 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 1800 leads the eastbound Mobase Local over drawbridge 39 in Tacoma, Washington, in 1953. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, trestle bridge.

Northern Pacific 1612 hauls the eastbound (south) Darrington Logger across the Stillaguamish River bridge at Arlington, Washington, on May 25, 1955. Photo by J.M. Fredrickson. Other Subject Classes: steam locomotive, freight train, truss bridge.

Northern Pacific steam locomotive 1361 at Bellingham, Washington with train on waterfront trestle. Other subject categories: Locomotive-Steam, Train-Freight, S-4, Bridge-Trestle

Northern Pacific mainline at Stampede Pass, Washington Territory, circa 1887. Three levels of track on switchback, timber trestles, logged hillside. J.M. Fredrickson collection. Other Subject Classes: track, switchback, bridge, mountains

Northern Pacific footbridge at Martin, Washington, in 1945. Wood bridge buckling under heavy snow. Photo by J.M. Fredrickson . Other Subject Classes: bridge

Northern Pacific footbridge at Martin, Washington, in 1943. Wood bridge, former route of switchback, mainline tracks. Photo by J.M. Fredrickson . Other Subject Classes: bridge, track, right of way