Railroad Archives Online
- D0036 - George Werkema Collection
- Ro`yxat003 - Great Northern Railway Company (U.S.)
- Ro`yxat-osti014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 006 - Cabooses (Railroads)
- img193 - Great Northern Caboose X47 at Wenatchee, Washington, 1968
- img194 - Great Northern Caboose X63 at Denver, Colorado, 1971
- img198 - Great Northern Caboose X101, 1970
- img199 - Great Northern Caboose X101, undated
- img200 - Great Northern Caboose X101, undated
- img201 - Great Northern Caboose X105 at Wenatchee, Washington, 1988
- img205 - Great Northern Caboose X224, undated
- img206 - Great Northern Caboose X224, undated
- img207 - Great Northern Caboose X224, undated
- 14 more...