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
- 76 more...
- 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
- ItemTRWahl0363 - Great Northern Diesel Locomotive 506, Bellingham, Washington, undated
- ItemTRWahl0369 - Great Northern Diesel Locomotive 271B, Bellingham, Washington, undated
- ItemTRWahl0370 - Great Northern Diesel Locomotive 271A, Bellingham, Washington, undated
- ItemTRWahl0389 - Great Northern Diesel Locomotive 500, Bellingham, Washington, undated
- 129 more...