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
- 229 more...
- ItemStruc001668 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001669 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001670 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001671 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001672 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001673 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001674 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1951
- ItemStruc001675 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001676 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 114 more...