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 3004 - Railroad passenger cars
- 103 more...
- ItemCNBk3img462 - Great Northern Railway Postal Car 237.
- ItemCNBk3img463 - Great Northern Railway Postal Car 237, Storage Mail Car.
- ItemCNBk3img464 - Great Northern Railway Postal Car 237, Storage Mail Car.
- ItemCNBk3img465 - Great Northern Railway Postal Car 251, Storage Mail Car at Seattle, Washington in 1972.
- ItemCNBk3img466 - Great Northern Railway Postal Car 253, Storage Mail Car.
- ItemCNBk3img467 - Great Northern Railway Postal Car 256, Storage Mail Car.
- ItemCNBk3img468 - Great Northern Railway Postal Car 257, Storage Mail Car at Minneapolis, Minnesota in 1973.
- ItemCNBk3img469 - Great Northern Railway Postal Car 263 at Minneapolis, Minnesota in 1973.
- ItemCNBk3img470 - Great Northern Railway Postal Car 221, Storage Mail Car.
- 157 more...