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 3001 - Steam Locomotives
- ItemTRWahl0022 - Milwaukee Road Steam Locomotive 1220, Bellingham, Washington, March-May 1951
- ItemTRWahl0024 - Milwaukee Road Steam Locomotive 1476, Bellingham, Washington, June-August 1952
- ItemTRWahl0380 - Milwaukee Road Steam Locomotive 1494, Bellingham, Washington, undated
- ItemTRWahl0382 - Milwaukee Road Steam Locomotive 1220, Bellingham, Washington, undated
- ItemTRWahl0383 - Milwaukee Road Steam Locomotive 1220, Bellingham, Washington, undated
- ItemTRWahl0429 - Milwaukee Road Steam Locomotive 1494, Bellingham, Washington, undated
- 5 more...