Railroad Archives Online
- FondsD0036 - George Werkema Collection
- Série003 - Great Northern Railway Company (U.S.)
- Sous-série014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 004 - Railroad Passenger Cars
- 38 en plus...
- Pièceimg317 - Great Northern Passenger Car 1335, undated
- Pièceimg318 - Great Northern Passenger Car 1384 at Bellevue, Ohio, 1991
- Pièceimg319 - Great Northern Passenger Car 2628, undated
- Pièceimg320 - Great Northern Passenger Car 2636, 1970
- Pièceimg321 - Great Northern Observation Car, undated