Northern Pacific bridge number 15 at Cabin Creek, Washington Territory, 1887. Trestle and truss span, construction train of flat cars with Decapod-type steam locomotive, workers, construction camp. Photo by J.M. Fredrickson collection.. Other Subject Classes: bridge, work train, steam locomotive, freight car, railroad employee, construction camp

Northern Pacific bridge number 13 at Stampede Pass, Washington Territory, 1887. Short trestle, workers. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: bridge, railroad employees

Northern Pacific bridge number 11 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 11 at Stampede Pass, Washington Territory, 1887. Tall timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge number 10 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 10 at Stampede Pass, Washington Territory, 1887. Tall timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge at Stampede Pass, Washington Territory, in 1887. Curved timber trestle at Station 70 on switchback. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback

Northern Pacific bridge at Stampede Pass, Washington Territory, in 1887. Timber trestle at Station 100 on switchback. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback

Northern Pacific bridge at Stampede Pass, Washington Territory, in 1887. Timber trestle at Station 224 on switchback, telegraph pole. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, telegraph equipment

Northern Pacific bridge at Stampede Pass, Washington Territory, in 1887. Timber trestle at Station 400 on switchback, logged-off hillside. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, mountains