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 3005 - Signals
- 7 more...
- ItemStruc006547 - Northern Pacific Engineering Drawing, Signal Maintainer's Tool House, Alaskan Way near Bell Street at Seattle, Washington, 1945
- ItemStruc006898 - Northern Pacific Engineering Drawing, Signal Maintainer's Dwelling at Garrison, Montana, 1954
- ItemStruc006899 - Northern Pacific Engineering Drawing, Signal Maintainer's Dwelling at Garrison, Montana, undated
- ItemStruc006900 - Northern Pacific Engineering Drawing, Signal Maintainer's Dwelling at Garrison, Montana, undated
- ItemBB028886 - Northern Pacific Engineering Drawing: 3 - Track Signal Bridge, Signal Bridge, Tacoma, Washington, undated
- ItemBB028887 - Northern Pacific Engineering Drawing: Replace Steel Bents, Signal Bridge, Tacoma, Washington, undated
- ItemBB029751 - Northern Pacific Engineering Drawing: Shop Plan - Cant Post, Signal Bridge, Missoula, Montana, undated