Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series002 - Chicago, Milwaukee, St. Paul, and Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- ItemTRWahl0077 - Milwaukee Road Diesel Locomotive 2225, Bellingham, Washington, undated
- ItemTRWahl0100 - Milwaukee Road Diesel Locomotive 1637, Bellingham, Washington, undated
- ItemTRWahl0101 - Milwaukee Road Diesel Locomotive 1637, Bellingham, Washington, undated
- ItemTRWahl0110 - Milwaukee Road Diesel Locomotive 1637, Bellingham, Washington, undated
- ItemTRWahl0111 - Milwaukee Road Diesel Locomotive 1637, Bellingham, Washington, undated
- 34 more...