Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3006 - Cabooses (Railroads)
- 15 more...
- Itemimg218 - Great Northern Caboose X443 at Rio Vista, California, 1991
- Itemimg219 - Great Northern Caboose X461 at Havre, Montana, 1972
- Itemimg220 - Great Northern Caboose X527 at Great Falls, Montana, 1974
- Itemimg221 - Great Northern Caboose X599, 1969
- Itemimg222 - Great Northern Caboose X679, 1960
- Itemimg223 - Great Northern Caboose at Issaquah, Washington, 1992
- Itemimg224 - Great Northern Caboose at Issaquah, Washington, 1992
- Itemimg225 - Great Northern Caboose at Issaquah, Washington, 1992