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
- 99 more...
- ItemCNBk3img458 - Great Northern Railway Postal Car 222, Storage Mail Car.
- ItemCNBk3img459 - Great Northern Railway Postal Car 225, Storage Mail Car.
- ItemCNBk3img460 - Great Northern Railway Postal Car 228, Storage Mail Car.
- ItemCNBk3img461 - Great Northern Railway Postal Car 237.
- 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.
- 161 more...