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 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