Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3008 - Tunnels
- 83 more...
- ItemStruc001502 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001503 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001504 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001505 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001506 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001507 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001508 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001509 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001510 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 260 more...