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
- 42 more...
- ItemTRWahl0181 - Great Northern Diesel Locomotive, Bellingham, Washington, undated
- ItemTRWahl0185 - Great Northern Diesel Locomotive 506, Bellingham, Washington, undated
- ItemTRWahl0187 - Great Northern Diesel Locomotive 159, Bellingham, Washington, undated
- ItemTRWahl0189 - Great Northern Diesel Locomotive 506, Bellingham, Washington, undated
- ItemTRWahl0210 - Great Northern Diesel Locomotive 510, Bellingham, Washington, undated
- ItemTRWahl0211 - Great Northern Diesel Locomotive 609, Bellingham, Washington, undated
- ItemTRWahl0214 - Great Northern Diesel Locomotive 610, Bellingham, Washington, undated
- ItemTRWahl0220 - Great Northern Diesel Locomotive 610, Bellingham, Washington, undated
- ItemTRWahl0258 - Great Northern Diesel Locomotive, Bellingham, Washington, undated
- 163 more...