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
- 163 more...
- ItemWWANT196 - Northern Pacific steam locomotive 1507 at Seattle, Washington, circa 1925.
- ItemWWANT197 - Northern Pacific steam locomotive 1566 at Seattle, Washington, circa 1935.
- ItemWWANT198 - Northern Pacific steam locomotive 1602 at Renton, Washington, in 1931.
- ItemWWANT199 - Northern Pacific steam locomotive 1602 at Seattle, Washington, circa 1925.
- ItemWWANT200 - Northern Pacific steam locomotive 1603 at Seattle, Washington, in 1925.
- ItemWWANT201 - Northern Pacific steam locomotive 1610 at Seattle, Washington, circa 1925.
- ItemWWANT202 - Northern Pacific steam locomotive 1610 at Seattle, Washington, circa 1925.
- ItemWWANT203 - Northern Pacific steam locomotive 1621 at Auburn, Washington, circa 1925.
- ItemWWANT204 - Northern Pacific steam locomotive 1621 at Ostrander, Washington, circa 1925.
- 96 more...