Northern Pacific switchback at Stampede Pass, Washington Territory, circa 1887. Switchback, two levels, timber trestles. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: switchback, bridge, mountains

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 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 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

Northern Pacific bridge number 9 at Stampede Pass, Washington Territory, 1887. Low timber trestle on switchback in snow. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback

Northern Pacific bridge number 8 at Stampede Pass, Washington Territory, 1887. Timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge number 8 at Stampede Pass, Washington Territory, 1887. Low timber trestle on switchback in snow. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, mountains