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 3003 - Freight Cars
- 6 more...
- ItemTRWahl0140 - Northern Pacific Boxcar 5017, Bellingham, Washington, undated
- ItemTRWahl0147 - Northern Pacific Boxcar 5501, Bellingham, Washington, undated
- ItemTRWahl0154 - Northern Pacific Boxcar 6004, Bellingham, Washington, undated
- ItemTRWahl0162 - Northern Pacific Boxcar 6004, Bellingham, Washington, undated
- ItemTRWahl0253 - Northern Pacific Boxcar 20303, Bellingham, Washington, undated
- ItemTRWahl0266 - Northern Pacific Flat Car 121093, Arlington, Washington, undated
- ItemTRWahl0277 - Northern Pacific Boxcar 5413, Bellingham, Washington, undated
- ItemTRWahl0281 - Northern Pacific Boxcar 1006, Bellingham, Washington, undated
- ItemTRWahl0467 - Northern Pacific Gondola 53867, Bellingham, Washington, undated
- 23 more...