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
- 45 more...
- Itemimg271 - Great Northern Water Car X6500 at Bellingham, Washington, 1982
- Itemimg272 - Great Northern Water Car X6500 at Bellingham, Washington, 1982
- Itemimg273 - Great Northern Maintenance of Way Flatcar X6706 at Bellingham, Washington, 1968
- Itemimg274 - Great Northern Snow Plow X7303 at Bonners Ferry, Idaho, 1990
- Itemimg275 - Great Northern Snow Plow X7303 at Bonners Ferry, Idaho, 1990
- Itemimg276 - Great Northern Maintenance of Way ex-Baggage Car X7836, undated
- Itemimg949 - Great Northern Maintenance of Way Speeder 3842 at Interbay, Washington, 1991