Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam Locomotives
- 75 more...
- ItemTRWahl0614 - Northern Pacific Steam Locomotive 1691, Bellingham, Washington, undated
- ItemTRWahl0635 - Northern Pacific Steam Locomotive 1108, Seattle, Washington, undated
- ItemTRWahl0636 - Northern Pacific Steam Locomotive 1126, Seattle, Washington, undated
- ItemTRWahl0637 - Northern Pacific Steam Locomotive 1041, Seattle, Washington, undated
- ItemTRWahl0638 - Northern Pacific Steam Locomotive 1116, Seattle, Washington, undated
- ItemTRWahl0641 - Northern Pacific Steam Locomotive 1782, Seattle, Washington, undated
- ItemTRWahl0642 - Northern Pacific Steam Locomotive 1380, Bellingham, Washington, undated
- ItemTRWahl0644 - Northern Pacific Steam Locomotive 1380, Bellingham, Washington, undated
- ItemTRWahl0645 - Northern Pacific Steam Locomotive 1612, Bellingham, Washington, undated
- 12 more...