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
- 345 more...
- ItemJMF03-02177.0 - Northern Pacific diesel locomotive number 6506 at Auburn, Washington, in 1948.
- ItemJMF03-02178.0 - Northern Pacific diesel locomotive number 6506 at Missoula, Montana, in 1949.
- ItemJMF03-02179.0 - Northern Pacific diesel locomotive number 6506 at Tacoma, Washington, in 1953.
- ItemJMF03-02180.0 - Northern Pacific diesel locomotive number 6507 at East Auburn, Washington, in 1950.
- ItemJMF03-02181.0 - Northern Pacific diesel locomotive number 6507 at Pasco, Washington, in 1951.
- ItemJMF03-02182.0 - Northern Pacific diesel locomotive number 6508 at Pasco, Washington, in 1949.
- ItemJMF03-02183.0 - Northern Pacific diesel locomotive number 6508 at Pasco, Washington, in 1949.
- ItemJMF03-02184.0 - Northern Pacific diesel locomotive number 6508 at Tacoma, Washington, in 1967.
- ItemJMF03-02185.0 - Northern Pacific diesel locomotive number 6509 at Tacoma, Washington, in 1967.
- 295 more...