Railroad Archives Online
- FondD0063 - Walter W. Ainsworth Collection
- Sorozat004 - Northern Pacific Railroad Company
- Alsorozat014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 003 - Freight Cars
- IratdarabWWANT105 - Northern Pacific railcars at Lake Union in Seattle, Washington, circa 1925.
- IratdarabWWANT106 - Northern Pacific railcars at Lake Union in Seattle, Washington, circa 1925.
- IratdarabWWANT213 - Northern Pacific steam locomotive 1682 near Black River, Washington, circa 1925.