Railroad Archives Online
- CollectionD0153 - Doug Wingfield Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3004 - Railroad Passenger Cars
- ItemWingfield.160 - Northern Pacific Passenger Car 558 at Seattle, Washington, 1962
- ItemWingfield.161 - Northern Pacific Passenger Car at Seattle, Washington, 1962