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 3006 - Cabooses (Railroads)
- 138 more...
- ItemCNBk3img261 - Great Northern Railway Caboose X639.
- ItemCNBk3img262 - Great Northern Railway Caboose X-639.
- ItemCNBk3img263 - Great Northern Railway Caboose X-639.
- ItemCNBk3img268 - Great Northern Railway Caboose X320.
- ItemCNBk3img271 - Great Northern Railway Caboose X639.
- ItemCNBk3img272 - Great Northern Railway Caboose X628.
- ItemCNBk3img276 - Great Northern Railway Caboose X320.
- ItemCNBk3img264 - Great Northern Railway Caboose X180 at Seattle, Washington.