Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 54 more...
- ItemTRWahl0270 - Great Northern Diesel Locomotive 500, Bellingham, Washington, undated
- ItemTRWahl0271 - Great Northern Diesel Locomotive, Bellingham, Washington, undated
- ItemTRWahl0272 - Great Northern Diesel Locomotive 50x, Bellingham, Washington, undated
- ItemTRWahl0280 - Great Northern Diesel Locomotive 281A, Bellingham, Washington, undated
- ItemTRWahl0282 - Great Northern Diesel Locomotive 281B, Bellingham, Washington, undated
- ItemTRWahl0283 - Great Northern Diesel Locomotive 281A, Bellingham, Washington, undated
- ItemTRWahl0286 - Great Northern Diesel Locomotive 510, Bellingham, Washington, undated
- ItemTRWahl0303 - Great Northern Diesel Locomotive 511, Bellingham, Washington, undated
- ItemTRWahl0307 - Great Northern Diesel Locomotive 500, Bellingham, Washington, undated
- 151 more...