Railroad Archives Online
- FondosD0027 - Timothy Miller Collection
- Series003 - Great Northern Railway Company (U.S.)
- Sub-series009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 129 more...
- ItemStruc001548 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 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
- 214 more...