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)
- ItemCNBk3img133 - Great Northern Railway Caboose X1 at Seattle, Washington in 1962.
- ItemCNBk3img267 - Great Northern Railway Caboose X634 at Seattle, Washington in 1965.
- ItemCNBk3img218 - Great Northern Railway Caboose X-226 at Burlington, Washington in 1968.
- ItemCNBk3img269 - Great Northern Railway Caboose X432 at Seattle, Washington in 1968.
- ItemCNBk3img273 - Great Northern Railway Caboose X-523 at Everett Washington in 1968.
- ItemCNBk3img138 - Great Northern Railway Caboose X-13 at Sioux City Iowa in 1969.
- ItemCNBk3img139 - Great Northern Railway Caboose X-14 at Sioux City Iowa in 1969.
- 139 more...