Railroad Archives Online
- FondiD0036 - George Werkema Collection
- Serija003 - Great Northern Railway Company (U.S.)
- Podserija014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 002 - Diesel Locomotives
- Dokumentimg1 - Great Northern Diesel Locomotive 10, undated
- Dokumentimg10 - Great Northern Diesel Locomotive 131 at Hillyard, Washington, 1965
- Dokumentimg106 - Great Northern Diesel Locomotive 2505 at Savanna, Illinois, 1974
- Dokumentimg107 - Great Northern Diesel Locomotive 2505 at Chicago, Illinois, 1974
- Dokumentimg108 - Great Northern Diesel Locomotive 2506 at Interbay, Washington, 1967
- 223 more...