Railroad Archives Online
- CollectionE0298 - Cordell Newby Photograph Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3005 - Work cars (Railroads)
- ItemCNBk2img254 - Great Northern Railway Tamper on tracks at Winton, Washington
- ItemCNBk2img267 - Great Northern Railway Snow Plow X1705 at Calumet, Minnesota
- ItemCNBk2img268 - Great Northern Railway Snow Plow X1705 at Calumet, Minnesota
- ItemCNBk2img269 - Great Northern Railway Snow Plow X1507 at Havre, Montana
- ItemCNBk2img270 - Great Northern Railway Snow Plow X1507
- 271 more...