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
- 305 more...
- ItemJMF03-02139.0 - Northern Pacific diesel locomotive number 6004 at Mandan, North Dakota, in 1950.
- ItemJMF03-02140.0 - Northern Pacific diesel locomotive number 6005 at Auburn, Washington, in 1950.
- ItemJMF03-02141.0 - Northern Pacific diesel locomotive number 6006 at Lester, Washington, circa 1950.
- ItemJMF03-02142.0 - Northern Pacific diesel locomotive number 6007 at Mandan, North Dakota, in 1950.
- ItemJMF03-02143.0 - Northern Pacific diesel locomotive number 6007 at South Tacoma, Washington, in 1952.
- ItemJMF03-02144.0 - Northern Pacific diesel locomotive number 6007.
- ItemJMF03-02145.0 - Northern Pacific diesel locomotive number 6008 at Scoria, North Dakota, in 1950.
- ItemJMF03-02146.0 - Northern Pacific diesel locomotive number 6008 at Glendive, Montana, in 1950.
- ItemJMF03-02147.0 - Northern Pacific diesel locomotive number 6009 at Tacoma, Washington, in 1970.
- 335 more...