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Union Pacific Railroad diesel locomotive number 3124 in helper service at Motanic, Oregon, in 1979. UP 3124 and 2509 help on the rear of UP freight train NP-SE (North Platte-Seattle). Jim is riding the dome car ahead of 2509 on its way to Seattle and Alaska. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train, helper locomotive-.

Union Pacific Railroad diesel locomotive number 308 at Richland, Washington on February 20, 1976. UP 308 leads a freight train near Richland in 1976. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Union Pacific Railroad diesel locomotive number 3018 at Tacoma, Washington, in 1979. UP 3018, 3160 and 3021 lead freight train No. 684 at Tacoma in 1979. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Union Pacific Railroad diesel locomotive number 3018 at Tacoma, Washington, in 1979. UP 3018, 3160 and 3021 lead freight train No. 684 at UP Junction in Tacoma in 1979. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Union Pacific Railroad diesel locomotive number 3001 at Hinkle, Oregon, in 1986. UP 3001 and 3007 running light at Hinkle Oregon in 1986. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive.

Union Pacific Railroad diesel locomotive number 2800 at Tacoma, Washington, in 1980. UP 2800 parked at Tacoma in 1980. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive.

Union Pacific Railroad diesel locomotive number 2056 at Nampa, idaho, in 1986. UP 2056 and 2050 stopped at Nampa in 1986. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Union Pacific Railroad diesel locomotive number 2050 at Nampa, idaho, in 1986. UP 2050 stopped at Nampa in 1986. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive, freight train.

Union Pacific Railroad diesel locomotive number 2040 at Yakima, Washington, undated. UP 2040 with 2004 on a freight train at Yakima. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive.

Union Pacific Railroad diesel locomotive number 2038 at Yakima, Washington, undated. UP 2038 with 2014 on a freight train at Yakima. Photo by J.M. Fredrickson. Other Subject Classes: diesel locomotive.