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
- 143 more...
- ItemJMF03-01984.0 - Northern Pacific diesel locomotive number 423 at Auburn, Washington, in 1970.
- ItemJMF03-01985.0 - Northern Pacific diesel locomotive number 424 at Auburn, Washington, in 1970.
- ItemJMF03-01986.0 - Northern Pacific diesel locomotive number 425 at Tacoma, Washington.
- ItemJMF03-01987.0 - Northern Pacific diesel locomotive number 427 at Tacoma, Washington, in 1952.
- ItemJMF03-01988.0 - Northern Pacific diesel locomotive number 427 at Auburn, Washington, in 1954.
- 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.
- 497 more...