Northern Pacific interlocking tower at Tacoma, Washington, circa 1943. Levers inside tower to control switches. Photo by J.M. Fredrickson . Other Subject Classes: interlocking tower, switch equipment

Northern Pacific interlocking tower at Tacoma, Washington, in 1944. Brick control tower at 15th Street and Pacific Avenue. Photo by J.M. Fredrickson . Other Subject Classes: interlocking tower

Northern Pacific interlocking tower at Tacoma, Washington, on October 22, 1967. Reservation tower, train order signal. Photo by J.M. Fredrickson . Other Subject Classes: interlocking tower, train order signal

Northern Pacific interlocking tower operator Carl Millmott at Tacoma, Washington, on October 22, 1967. Operating lever at Reservation tower. Photo by J.M. Fredrickson . Other Subject Classes: railroad employee, interlocking tower

Northern Pacific interlocking tower at Tacoma, Washington, on October 22, 1967. Reservation tower, train order signal, northbound freight train with run-through Southern Pacific power approaching in distance. Photo by J.M. Fredrickson . Other Subject Classes: interlocking tower, train order signal, freight train

Northern Pacific junction at Tacoma, Washington, circa 1927. Joint facilities view of new Reservation tower under construction, new track arrangement, workers installing interlocking and other equipment. Photo by James Fisher, J.M. Fredrickson collection. Other Subject Classes: railroad yard, interlocking tower, railroad employee

Northern Pacific Land Company Building at Tacoma, Washington, circa 1875. Large frame mansion on hillside, children in front. J.M. Fredrickson collection. Other Subject Classes: office building, house, people

Northern Pacific Land Company Building at Tacoma, Washington, circa 1920. Frame Victorian mansion in state of deterioration, autos at curb. J.M. Fredrickson collection. Other Subject Classes: office building, house, automobile

DISPUTE DATA Northern Pacific Land Company Building at Tacoma, Washington, circa 1920. Tacoma Land Co Building Copy, Davidson photo. J.M. Fredrickson collection. Other Subject Classes: Land Company Building,

Northern Pacific living quarters at Martin, Washington, on January 21, 1959. Company living quarters, signal bridge in snow. Photo by J.M. Fredrickson. Other Subject Classes: living quarters, signal equipment