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
- 354 more...
- ItemJMF03-02186.0 - Northern Pacific diesel locomotive number 6509 circa 1950.
- ItemJMF03-02187.0 - Northern Pacific diesel locomotive number 6511 at Tacoma, Washington, in 1950.
- ItemJMF03-02188.0 - Northern Pacific diesel locomotive number 6511 at East Auburn, Washington, in 1950.
- ItemJMF03-02189.0 - Northern Pacific diesel locomotive number 6512 at Tacoma, Washington, in 1950.
- ItemJMF03-02190.0 - Northern Pacific diesel locomotive number 6512 at Easton, Washington, in 1950.
- ItemJMF03-02191.0 - Northern Pacific diesel locomotive number 6513 at Seattle, Washington, circa 1950.
- ItemJMF03-02192.0 - Northern Pacific diesel locomotive number 6513 at Jamestown, North Dakota, in 1952.
- ItemJMF03-02193.0 - Northern Pacific diesel locomotive number 6513 circa 1950.
- ItemJMF03-02194.0 - Northern Pacific diesel locomotive number 6514 at Manitoba Junction, Minnesota, in 1954.
- 286 more...