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
- 56 more...
- ItemStruc001475 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001476 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- ItemStruc001477 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001478 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001479 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001480 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001481 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001482 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- ItemStruc001483 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- 287 more...