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)
- 7 more...
- Itemimg206 - Great Northern Caboose X224, undated
- Itemimg207 - Great Northern Caboose X224, undated
- Itemimg208 - Great Northern Caboose X224 at Wenatchee, Washington, 1968
- Itemimg209 - Great Northern Caboose X258 at Wenatchee, Washington, 1968
- Itemimg212 - Great Northern Caboose X304 at South Bellingham, Washington, 1966
- Itemimg213 - Great Northern Caboose X304 at South Bellingham, Washington, 1966
- Itemimg216 - Great Northern Caboose X432, 1968
- Itemimg217 - Great Northern Caboose X432 at Hillyard, Washington, 1965
- Itemimg218 - Great Northern Caboose X443 at Rio Vista, California, 1991
- 7 more...