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
- 91 more...
- ItemStruc001510 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001511 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001512 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001513 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001514 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001515 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001516 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1979
- ItemStruc001517 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1975
- ItemStruc001518 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1975
- 252 more...