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
- ItemStruc002503 - Northern Pacific Engineering Drawing, Telephone Exchange Building at Leadore, Idaho, 1960
- ItemStruc002514 - Northern Pacific Engineering Drawing, Waybill and Telephone Building at Longview Junction, Washington, 1968
- ItemStruc002637 - Northern Pacific Engineering Drawing, Signal Maintainers House Toilet and Water Facilities at Manitoba Junction, Minnesota, 1959
- ItemStruc002638 - Northern Pacific Engineering Drawing, Signal Maintainers House Toilet and Water Facilities at Manitoba Junction, Minnesota, 1953
- ItemStruc002639 - Northern Pacific Engineering Drawing, Signal Maintainers House Toilet and Water Facilities at Manitoba Junction, Minnesota, 1954
- ItemStruc005437 - Northern Pacific Engineering Drawing, Signal Maintainer Car House at Sela, Washington, 1953
- ItemStruc006546 - Northern Pacific Engineering Drawing, Signal Maintainer's Tool House, Alaskan Way near Bell Street at Seattle, Washington, 1945
- ItemStruc006547 - Northern Pacific Engineering Drawing, Signal Maintainer's Tool House, Alaskan Way near Bell Street at Seattle, Washington, 1945
- 6 more...