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 3005 - Maintenance of Way cars
- 35 more...
- Itemimg261 - Great Northern Maintenance of Way Tool Car X5180, undated
- Itemimg262 - Great Northern Maintenance of Way ex-Boxcar X5372 at Cle Elum, Washington, 1999
- Itemimg263 - Great Northern Maintenance of Way ex-Boxcar X5372 at Cle Elum, Washington, 1969
- Itemimg264 - Great Northern Maintenance of Way ex-Boxcar X5372 at Cle Elum, Washington, 1999
- Itemimg265 - Great Northern Maintenance of Way Tool Car O6001 at Bellingham, Washington, 1969
- Itemimg266 - Great Northern Maintenance of Way Tool Car O6021 at Bellingham, Washington, 1966
- Itemimg267 - Great Northern Maintenance of Way ex-Boxcar O6040 at Cle Elum, Washington, 1999
- Itemimg268 - Great Northern Maintenance of Way ex-Boxcar O6040 at Cle Elum, Washington, 1999
- Itemimg269 - Great Northern Water Car X6500 at Bellingham, Washington, 1982
- 8 more...