Railroad Archives Online
- FondD0036 - George Werkema Collection
- Sorozat003 - Great Northern Railway Company (U.S.)
- Alsorozat014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 006 - Cabooses (Railroads)
- Iratdarabimg193 - Great Northern Caboose X47 at Wenatchee, Washington, 1968
- Iratdarabimg194 - Great Northern Caboose X63 at Denver, Colorado, 1971
- Iratdarabimg198 - Great Northern Caboose X101, 1970
- Iratdarabimg199 - Great Northern Caboose X101, undated
- Iratdarabimg200 - Great Northern Caboose X101, undated
- Iratdarabimg201 - Great Northern Caboose X105 at Wenatchee, Washington, 1988
- Iratdarabimg205 - Great Northern Caboose X224, undated
- Iratdarabimg206 - Great Northern Caboose X224, undated
- Iratdarabimg207 - Great Northern Caboose X224, undated
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