Northern Pacific freight yard at Tacoma, Washington, circa 1920. East end of yard with semaphore signals, Seattle-Tacoma Interurban trestle in distance. J.M. Fredrickson collection.. Other Subject Classes: railroad yard, signal, bridge

Northern Pacific freight yard at Auburn, Washington, on August 10, 1967. Looking north in yard, switch tender sitting during lull. Photo by J.M. Fredrickson. Other Subject Classes: railroad yard, railroad employee

Northern Pacific freight yard at Auburn, Washington, on August 10, 1967. Looking north at freight trains meeting. Photo by J.M. Fredrickson. Other Subject Classes: railroad yard, freight train

Northern Pacific freight yard at Auburn, Washington, circa 1925. Looking north in yard with coal dock, distant roundhouse facilities, standing freight cars, mainline at left. Copy of Postcard. J.M. Fredrickson collection. Other Subject Classes: railroad yard, coal dock, freight car

New Haven Railroad interlocking tower at Old Saybrook, Connecticut, on January 28, 1977. Railroad interlocking tower at Old Saybrook Connecticut in 1977 Photo by J.M. Fredrickson. Other Subject Classes: interlocking tower

Nevada County Narrow Gauge Railroad Museum Museum Yard at Nevada City, California, undated. Photograph by Wade Stevenson.

Nevada County Narrow Gauge Railroad Museum Museum Yard at Nevada City, California, undated. Photograph by Wade Stevenson.

Mud Bay Logging Company loggers pose on a log suspended over disconnected log trucks at Mud Bay Washington circa 1921. Photo from J.M. Fredrickson Collection. Other Subject Classes: log reload facility, log car.

Milwaukee Road freight yard at Bellingham, Washington looking west across Milwaukee Road lower yard, with Puget Sound Pulp & Timber Company in background; photograph sequence TRWahl0451-0449. Other subject categories: Yard-Freight, Car-Box, Freight, Car-Gondola

Milwaukee Road freight yard at Bellingham, Washington. View northwest from Northern Pacific main track on trestle across Milwaukee Road lower yard; Columbia Valley Lumber Company visible. Other subject categories: Yard-Freight, Industrial Buildings, Freight, Car-Box