Railroad Archives Online
- ArkivD0288 - Terence Wahl Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 002 - Diesel Locomotives
- ObjektTRWahl0001 - Great Northern Diesel Locomotive 609, Rockport, Washington, undated
- ObjektTRWahl0002 - Great Northern Diesel Locomotive with Freight Train, Kelso, Washington, August 1951
- ObjektTRWahl0003 - Great Northern Diesel Locomotive 275A, Havre, Montana, undated
- ObjektTRWahl0026 - Great Northern Diesel Locomotive 351C, Bellingham, Washington, undated
- ObjektTRWahl0027 - Great Northern Diesel Locomotive 261A, Bellingham, Washington, undated
- 209 mer...