Railroad Archives Online
- FondsD0153 - Doug Wingfield Collection
- Serie001 - Burlington Northern Railroad Company
- Teilserie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 004 - Railroad Passenger Cars
- ObjektWingfield.3 - Great Northern Passenger Car 478 at Eureka, Montana, 1970
- ObjektWingfield.55 - Great Northern Passenger Car 1111 at Flathead Tunnel, Montana, 1970
- ObjektWingfield.56 - Great Northern Coach 1212 (part of the Burlington Northern since March 1, 1970) at Whitefish, Montana, October 31, 1970.