Northern Pacific diesel locomotive number 137 at the engine facility in Tacoma, Washington, in 1966. NP 137 is a SW 1200 built by Electro Motive Division of General Motors Company in 1956. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 144 in a yard. NP 144 is a SW 1200 built by Electro Motive Division of General Motors Company in 1956. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 145 at the roundhouse at Auburn, Washington. NP 145 is a SW 1200 built by Electro Motive Division of General Motors Company 1956. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 145 at the engine facility in Tacoma, Washington, on April 13, 1970. NP 145 is a SW 1200 built by Electro Motive Division of General Motors Company in 1956. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 146 in a yard. NP 146 is a SW 1200 built by Electro Motive Division of General Motors Company in 1956. Photo by Herman Hunt, J.M. Fredrickson collection. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 149 in the engine facility at Tacoma, Washington, in 1966. NP 149 is a SW 1200 built by Electro Motive Division of General Motors Company in 1957. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 150 in the Tacoma, Washington, roundhouse circa 1946. First NP 150 is an S-2 built by American Locomotive Company in 1943. The unit was renumbered to 708 in 1950. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 155 at the engine facility at Auburn, Washington, circa 1946. First NP 155 is a RS-1 built by American Locomotive Company in 1945. The unit was renumbered to 800 in 1950. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 158 the yard at Dilworth, Minnesota, on September 1946. First NP 158 is a RS-1 built by American Locomotive Company in 1945. The unit was renumbered to 803 in 1950. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive

Northern Pacific diesel locomotive number 159 in the engine facility at Auburn, Washington, circa 1949. NP 159 is a VO 1000 built by Baldwin in 1945 and was renumbered to 412 in 1950. A 1000 hp engine was installed in this unit in 1957 by EMD. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, switcher locomotive