Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3001 - Steam Locomotives
- 252 more...
- ItemWWANT290 - Northern Pacific steam locomotive number 4006 at Martin, Washington, 1924.
- ItemWWANT291 - Northern Pacific steam locomotive number 4005 at Martin, Washington, 1924.
- ItemWWANT292 - Northern Pacific steam locomotive number 4008 at Kanaskat, Washington, 13721.
- ItemWWANT293 - Northern Pacific steam locomotive number 4006 at Stampede, Washington, 9677.
- ItemWWANT294 - Northern Pacific steam locomotive number 4009 at Auburn, Washington, circa 1928.
- ItemWWANT295 - Northern Pacific steam locomotive number 4009 at Auburn, Washington, circa 1928.
- ItemWWANT296 - Northern Pacific steam locomotive number 4009 at Easton, Washington, circa 1928.
- ItemWWANT297 - Northern Pacific steam locomotive number 4010 at Stampede, Washington, circa 1928.
- ItemWWANT298 - Northern Pacific steam locomotive number 4010 at Stampede, Washington, circa 1928.
- 6 more...