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
- 148 more...
- ItemJMF03-01989.0 - Northern Pacific diesel locomotive number 500 at Tacoma, Washington, in 1952.
- ItemJMF03-01990.0 - Northern Pacific diesel locomotive number 550 at Dilworth, Minnesota, in 1952.
- ItemJMF03-01991.0 - Northern Pacific diesel locomotive number 551 at Dilworth, Minnesota, in 1954.
- ItemJMF03-01992.0 - Northern Pacific diesel locomotive number 553.
- ItemJMF03-01993.0 - Northern Pacific diesel locomotive number 555 at Pasco, Washington, in 1953.
- ItemJMF03-01994.0 - Northern Pacific diesel locomotive number 555 at Auburn, Washington, in 1970.
- ItemJMF03-01995.0 - Northern Pacific diesel locomotive number 556 at Spokane, Washington, in 1952.
- ItemJMF03-01996.0 - Northern Pacific diesel locomotive number 557 at Arlington, Washington, in 1952.
- ItemJMF03-01997.0 - Northern Pacific diesel locomotive number 557 at Tacoma, Washington, in 1970.
- 492 more...