Northern Pacific bridge near Cle Elum, Washington Territory, in 1887. Timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge at Deep Creek, Washington Territory, 1887. Timber trestle and truss span west of Cle Elum. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: bridge,

Northern Pacific mainline and bridge at Kelly Butte, Washington, in May 1969. Looking down single track toward truss bridge. Photo by J.M. Fredrickson . Other Subject Classes: track, bridge, mountains

Northern Pacific bridge at Martin, Washington, circa 1917. Derelict partially collapsed timber trestle, remnant of old switchback, in snow. From Ackley album, J.M. Fredrickson collection. Other Subject Classes: bridge

Northern Pacific bridge at Stampede Pass, Washington Territory, circa 1887. Timber trestle, track workers, handcar. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: bridge, railroad employee, track car

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, circa 1890. Derelict remains of timber trestle on old switchback. J.M. Fredrickson collection. Other Subject Classes: bridge, switchback

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