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
- 72 more...
- ItemTRWahl0328 - Great Northern Diesel Locomotive 606, Bellingham, Washington, undated
- ItemTRWahl0329 - Great Northern Diesel Locomotive 606, Bellingham, Washington, undated
- ItemTRWahl0330 - Great Northern Diesel Locomotive 606, Bellingham, Washington, undated
- ItemTRWahl0331 - Great Northern Diesel Locomotive 502, Bellingham, Washington, undated
- ItemTRWahl0332 - Great Northern Diesel Locomotive 503, Bellingham, Washington, undated
- ItemTRWahl0335 - Great Northern Diesel Locomotive 635, Bellingham, Washington, undated
- ItemTRWahl0336 - Great Northern Diesel Locomotive 635, Bellingham, Washington, undated
- ItemTRWahl0337 - Great Northern Diesel Locomotive 635, Bellingham, Washington, undated
- ItemTRWahl0338 - Great Northern Diesel Locomotive 635, Bellingham, Washington, undated
- 133 more...