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
- 15 more...
- ItemStruc001434 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001435 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001436 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001437 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001438 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001439 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001440 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001441 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001442 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 328 more...