Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel locomotives
- 189 more...
- ItemJMF03-02028.0 - Northern Pacific diesel locomotive number 2506 at Auburn, Washington, in 1963.
- ItemJMF03-02029.0 - Northern Pacific diesel locomotive number 2508 at Auburn, Washington, in 1967.
- ItemJMF03-02030.0 - Northern Pacific diesel locomotive number 2508 at Auburn, Washington, in 1967.
- ItemJMF03-02031.0 - Northern Pacific diesel locomotive number 2510 at Auburn, Washington, in 1967.
- ItemJMF03-02032.0 - Northern Pacific diesel locomotive number 2512 at Auburn, Washington, in 1967.
- ItemJMF03-02033.0 - Northern Pacific diesel locomotive number 2516 at Auburn, Washington, in 1968.
- ItemJMF03-02034.0 - Northern Pacific diesel locomotive number 2520 at Auburn, Washington, in 1968.
- ItemJMF03-02034.1 - Northern Pacific diesel locomotive number 2520 at Auburn, Washington, in 1968.
- ItemJMF03-02035.0 - Northern Pacific diesel locomotive number 2521 at Auburn, Washington, in 1967.
- 451 more...