Railroad Archives Online
- FondoD0036 - George Werkema Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 006 - Cabooses (Railroads)
- 4 in più...
- Unità documentariaimg200 - Great Northern Caboose X101, undated
- Unità documentariaimg201 - Great Northern Caboose X105 at Wenatchee, Washington, 1988
- Unità documentariaimg205 - Great Northern Caboose X224, undated
- Unità documentariaimg206 - Great Northern Caboose X224, undated
- Unità documentariaimg207 - Great Northern Caboose X224, undated
- Unità documentariaimg208 - Great Northern Caboose X224 at Wenatchee, Washington, 1968
- Unità documentariaimg209 - Great Northern Caboose X258 at Wenatchee, Washington, 1968
- Unità documentariaimg212 - Great Northern Caboose X304 at South Bellingham, Washington, 1966
- Unità documentariaimg213 - Great Northern Caboose X304 at South Bellingham, Washington, 1966
- 10 in più...