Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series010 - Other Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam Locomotives
- ItemTRWahl0025 - Lyman Timber Company Steam Locomotive 6, Lyman, Washington, undated
- ItemTRWahl0875 - Skagit Railway/Seattle City Light Steam Locomotive 6, Newhalem, Washington, undated
- ItemTRWahl0876 - Skagit Railway/Seattle City Light Steam Locomotive 6, Newhalem, Washington, undated
- ItemTRWahl0877 - Skagit Railway/Seattle City Light Steam Locomotive 6, Newhalem, Washington, undated