Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series006 - Southern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- ItemTRWahl0103 - Southern Pacific Boxcar 63917, Bellingham, Washington, undated
- ItemTRWahl0267 - Southern Pacific Boxcar 38525, Arlington, Washington, undated