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
- 86 more...
- ItemTRWahl0424 - Great Northern Diesel Locomotive 602, Bellingham, Washington, undated
- ItemTRWahl0425 - Great Northern Diesel Locomotive 602, Bellingham, Washington, undated
- ItemTRWahl0426 - Great Northern Diesel Locomotive 602, Bellingham, Washington, undated
- ItemTRWahl0427 - Great Northern Diesel Locomotive 602, Bellingham, Washington, undated
- ItemTRWahl0428 - Great Northern Diesel Locomotive 611, Bellingham, Washington, undated
- ItemTRWahl0433 - Great Northern Diesel Locomotive 602, Bellingham, Washington, undated
- ItemTRWahl0435 - Great Northern Diesel Locomotive, Seattle, Washington, undated
- ItemTRWahl0442 - Great Northern Diesel Locomotive 510, Bellingham, Washington, undated
- ItemTRWahl0458 - Great Northern Diesel Locomotive 610, Bellingham, Washington, undated
- 119 more...