Railroad Archives Online
- ArquivoD0063 - Walter W. Ainsworth Collection
- Série004 - Northern Pacific Railroad Company
- Subsérie014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 004 - Railroad Passenger Cars
- ItemWWANT028 - A Northern Pacific passenger train at Seattle, Washington, circa 1935.
- ItemWWANT046 - Northern Pacific passenger train at Seattle, Washington, circa 1935.
- ItemWWANT081 - Northern Pacific steam locomotive leads a passenger train at Black River, Washington, circa 1941.