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
- 206 more...
- ItemTRWahl1044 - Great Northern Diesel Locomotive, Bellingham, Washington, undated
- ItemTRWahl1049 - Great Northern Diesel Locomotive 263A, Bellingham, Washington, undated
- ItemTRWahl1071 - Great Northern Diesel Locomotive 607, Bellingham, Washington, undated
- ItemTRWahl1093 - Great Northern Diesel Locomotive 116, Bellingham, Washington, undated
- ItemTRWahl1094 - Great Northern Diesel Locomotive 116, Bellingham, Washington, undated
- ItemTRWahl1095 - Great Northern Diesel Locomotive 116, Bellingham, Washington, undated
- ItemTRWahl0311 - Great Northern Diesel Locomotive, Washington, undated
- ItemTRWahl0084 - Great Northern Diesel Locomotive 511, Bellingham, Washington, undated