Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3007 - Track
- ItemStruc002622 - Northern Pacific Engineering Drawing, Crossing Watchman's House at Kelso, Washington, 1961
- ItemStruc005229 - Northern Pacific Engineering Drawing, Floodlights at Yardley, Washington, 1959
- ItemStruc005441 - Northern Pacific Engineering Drawing, Side Warning Telltale at East Auburn, Washington, 1945
- ItemStruc005443 - Northern Pacific Engineering Drawing, Side Warning Telltale at East Auburn, Washington, 1946
- ItemStruc005603 - Northern Pacific Engineering Drawing, Control Tower at Missoula, Montana, 1967
- ItemStruc005604 - Northern Pacific Engineering Drawing, Control Tower at Missoula, Montana, 1966
- 322 more...