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
- ItemTRWahl0010 - Northern Pacific Boxcar 39885, Bellingham, Washington, August 1951
- ItemTRWahl0115 - Northern Pacific Log Car 124352, Bellingham, Washington, undated
- ItemTRWahl0116 - Northern Pacific Log Car 124562, Bellingham, Washington, undated
- ItemTRWahl0117 - Northern Pacific Log Car 121520, Bellingham, Washington, undated
- ItemTRWahl0125 - Northern Pacific Boxcar 6033, Bellingham, Washington, undated
- ItemTRWahl0139 - Northern Pacific Boxcar 5017, Bellingham, Washington, undated
- ItemTRWahl0140 - Northern Pacific Boxcar 5017, Bellingham, Washington, undated
- ItemTRWahl0147 - Northern Pacific Boxcar 5501, Bellingham, Washington, undated
- ItemTRWahl0154 - Northern Pacific Boxcar 6004, Bellingham, Washington, undated
- 29 more...