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
- 331 more...
- ItemJMF03-02163.0 - Northern Pacific diesel locomotive number 6501 at Butte, Montana, in 1949.
- ItemJMF03-02164.0 - Northern Pacific diesel locomotive number 6502 at Seattle, Washington, in 1947.
- ItemJMF03-02165.0 - Northern Pacific diesel locomotive number 6502 at Seattle, Washington, in 1947.
- ItemJMF03-02166.0 - Northern Pacific diesel locomotive number 6502 at Auburn, Washington.
- ItemJMF03-02167.0 - Northern Pacific diesel locomotive number 6503 at Tacoma, Washington, in 1949.
- ItemJMF03-02168.0 - Northern Pacific diesel locomotive number 6503 at Spokane, Washington, in 1952.
- 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.
- 309 more...