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 construction buildings at Stampede Pass, Washington Territory, circa 1886. Switchback WT. Switch #5. J.M. Fredrickson collection. Other Subject Classes: construction buildings, tracks,

Northern Pacific construction gang at Stampede Pass, Washington Territory, circa 1885. Chinese workers shoveling snow off grade prior to laying track over switchback. J.M. Fredrickson collection. Other Subject Classes: railroad employee, right of way, switchback

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 engineering offices on Stampede Pass, Washington Territory, 1887. "Old headquarters," camp 1, frame buildings with children. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: construction camp, people

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 mainline at Stampede Pass, Washington Territory, in 1887. Summit of switchback at Lizard Lake in forested area. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: tracks, switchback, mountains

Northern Pacific mainline at Stampede Pass, Washington Territory, in 1887. Three levels of track at summit of switchback, frame section house. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: track, switchback, section house, mountains

Northern Pacific snowplow at Stampede Pass, Washington Territory, circa 1887. Steam snowplow and locomotives, workers, on trestle in snow. J.M. Fredrickson collection. Other Subject Classes: snowplow, steam locomotive, bridge, railroad employee, mountains