Northern Pacific diesel locomotive number 2506 in the engine facility at Auburn, Washington, on April 08, 1968. NP 2506 is a U25C built by General Electric in 1964. It is coupled to F-9B NP 7012B. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive,

Northern Pacific diesel locomotive number 2506 in the engine facility at Auburn, Washington, on April 08, 1963. NP 2506 is a U25C built by General Electric in 1964. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight locomotive

Northern Pacific diesel locomotive number 2508 in the engine facility at Auburn, Washington, on March 21, 1967. NP 2508 is a U25C built by General Electric in 1964. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight locomotive

Northern Pacific diesel locomotive number 251 in the engine facility at Auburn, Washington, on March 24, 1970. NP 251 is a GP-9 built by Electro Motive Division of General Motors Company in 1956. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, road switcher

Northern Pacific diesel locomotive number 2508 in the engine facility at Auburn, Washington, on July 02, 1967. NP 2508 is a U25C built by General Electric in 1964. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight locomotive

Northern Pacific diesel locomotive number 2510 in the engine facility at Auburn, Washington, on March 21, 1967. NP 2510 is a U25C built by General Electric in 1964. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight locomotive

Northern Pacific diesel locomotive number 2512 in the engine facility at Auburn, Washington, on October 09, 1967. NP 2512 is a U25C built by General Electric in 1964. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight locomotive

Northern Pacific diesel locomotive number 252 in a yard at Tacoma, Washington, on March 06, 1967. NP 252 is a GP-9 built by Electro Motive Division of General Motors Company in 1956. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, road switcher

Northern Pacific diesel locomotive number 2516 in the engine facility at Auburn, Washington, on May 1968. NP 2516 is a U25C built by General Electric in 1965. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight locomotive

Northern Pacific diesel locomotive number 2520 in the engine facility at Auburn, Washington, on May 07, 1968. NP 2520 is a U25C built by General Electric in 1965. The Auburn roundhouse appears in the background. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight locomotive