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
- 130 more...
- ItemStruc001549 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001550 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001551 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- ItemStruc001552 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- ItemStruc001553 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- ItemStruc001554 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- ItemStruc001555 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001556 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001557 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 213 more...