Railroad Archives Online
- FondD0063 - Walter W. Ainsworth Collection
- Sorozat004 - Northern Pacific Railroad Company
- Alsorozat014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 011 - Railroad cars self-propelled
- IratdarabWWANT019 - Northern Pacific gas electric motor car B-19 at Seattle, Washington, in 1938.
- IratdarabWWANT054 - Northern Pacific gas electric motor car B-19 at Seattle, Washington, in 1939.
- IratdarabWWANT083 - Northern Pacific gas electric motor car B-18 at Black River, Washington, circa 1935.
- IratdarabWWANT108 - Northern Pacific gas electric motor car B-18 at South Bend, Washington, in 1929.