Railroad Archives Online
- CollectionE0298 - Cordell Newby Photograph Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3007 - Tractor trailers
- ItemCNBk4img168 - Great Northern Railway Trailer 1100 at Wenatchee, Washington in 1974.
- ItemCNBk4img169 - Great Northern Railway Trailer G336 at Pasco, Washington in 1971.
- ItemCNBk4img170 - Great Northern Railway Trailer 20772 at Pasco, Washington in 1972.
- ItemCNBk4img171 - Great Northern Railway Trailer GNZ 50-1101 at Wenatchee, Washington in 1971.