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
- 186 more...
- ItemWWANT221 - Northern Pacific steam locomotive 1776 at Argo, Washington, in 1947.
- ItemWWANT222 - Northern Pacific steam locomotive 1780 at Borup Loop, Washington, circa 1925.
- ItemWWANT223 - Northern Pacific steam locomotive 1834 at Auburn, Washington, circa 1925.
- ItemWWANT224 - Northern Pacific steam locomotive 1783 at Black River, Washington, circa 1941.
- ItemWWANT226 - Northern Pacific steam locomotive 1834 at Auburn, Washington, circa 1925.
- ItemWWANT227 - Northern Pacific steam locomotive 1840 at Auburn, Washington, circa 1925.
- ItemWWANT228 - Northern Pacific steam locomotive 1841 at Auburn, Washington, circa 1925.
- ItemWWANT229 - Northern Pacific steam locomotive 1841 at Auburn, Washington, circa 1925.
- ItemWWANT230 - Northern Pacific steam locomotive 1841 at Auburn, Washington, circa 1925.
- 73 more...