Northern Pacific bridge number 17 at Stampede Pass, Washington Territory, 1887. Low timber trestle on switchback, logged-off mountains. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, mountains

Northern Pacific bridge number 16 at Stampede Pass, Washington Territory, 1887. Curved timber trestle on switchback in snow, logged-off mountains. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, mountains

Northern Pacific bridge number 16 at Cabin Creek, Washington Territory, 1887. Trestle over Cabin Creek. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: bridge

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. Tall timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

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 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 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 at Stampede Pass, Washington Territory, in 1887. Large timber trestle at Station 253 on switchback, track inspector on velocipede. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, railroad employee, velocipede, mountains

Northern Pacific bridge at Stampede Pass, Washington Territory, in 1887. Timber trestle at Station 379 on switchback, logged-off hillside. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, mountains