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
- 337 more...
- ItemJMF03-02169.0 - Northern Pacific diesel locomotive number 6504 at Pasco, Washington, in 1948.
- ItemJMF03-02170.0 - Northern Pacific diesel locomotive number 6504 at East Olympia, Washington, circa 1950.
- ItemJMF03-02171.0 - Northern Pacific diesel locomotive number 6504 at East Auburn, Washington, in 1950.
- ItemJMF03-02172.0 - Northern Pacific diesel locomotive number 6504 at Spokane, Washington, in 1950.
- ItemJMF03-02173.0 - Northern Pacific diesel locomotive number 6505 at Spokane, Washington, in 1949.
- ItemJMF03-02174.0 - Northern Pacific diesel locomotive number 6506 at Auburn, Washington, in 1947.
- ItemJMF03-02175.0 - Northern Pacific diesel locomotive number 6506 at Auburn, Washington, in 1947.
- ItemJMF03-02176.0 - Northern Pacific diesel locomotive number 6506 at Auburn, Washington, in 1954.
- ItemJMF03-02177.0 - Northern Pacific diesel locomotive number 6506 at Auburn, Washington, in 1948.
- 303 more...