Northern Pacific bridge number 21 at Stampede Pass, Washington Territory, in 1887. Early construction of timber trestle, workers. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: bridge, railroad employee

Northern Pacific bridge number 3 at Stampede Pass, Washington Territory, 1887. Short timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge number 32 at Stampede Pass, Washington Territory, 1887. Timber trestle on switchback, horse-drawn construction wagon in distance. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, wagon

Northern Pacific bridge number 4 at Stampede Pass, Washington Territory, 1887. Short timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge number 4 at Stampede Pass, Washington Territory, 1887. Short timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge number 4 at Stampede Pass, Washington Territory, 1887. Long curved trestle on switchback, workers. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback, railroad employee

Northern Pacific bridge number 40 over Yakima River, Washington Territory, in 1887. Short timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: trestle bridge,

Northern Pacific bridge number 5 at Stampede Pass, Washington Territory, in 1887. Long timber trestle on switchback, two men walking on track, in snow. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, switchback

Northern Pacific bridge number 5 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. Timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track