Staff machine for operating trains through single-track territory, as used by Northern Pacific between Stampede and Martin, Washington. Copy from Union Pacific rule book. Photo by J.M. Fredrickson . Other Subject Classes: signal equipment

SP&S diesel locomotive Number 866, an American Locomotive Company (ALCO) FA-1, with an eastbound freight coming out of the Cape Horn tunnel, undated. Photo by Spokane, Portland & Seattle Railway.

South portal of Great Northern Railway tunnel at Seattle, Washington. South Portal and interlocking. Other subject classes: Tunnel Portal

A view of the UD (South Portal) tower and single-slip switch located at north end of King Street Station, Seattle, Washington. From Great Northern Railway Historical Society Reference Sheet 281.

Northern Pacific tracks at Martin, Washington, in February 1945. Track and buildings, east portal of Stampede Tunnel, in snow. Photo by J.M. Fredrickson . Other Subject Classes: track, town scene, tunnel

Northern Pacific Stampede Tunnel at Martin, Washington, circa 1944. East portal and snowshed of tunnel, station, signal, outbuildings, in heavy snow. Photo by J.M. Fredrickson . Other Subject Classes: tunnel, station, signal

Northern Pacific tunnel at Borup, Washington, in 1914. Old tunnel number 6, new bypass under construction, construction workers. Photo by Corey, J.M. Fredrickson collection.. Other Subject Classes: tunnel, construction workers, track

Northern Pacific tracks and buildings at Martin, Washington, circa 1950. View from diesel locomotive cab of mainline and yard, living quarters, east portal of Stampede Tunnel. Max King photo. Photo by Max King, J.M. Fredrickson collection.. Other Subject Classes: track, railroad yard, living quarters, tunnel, mountains