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
- 174 more...
- ItemStruc001593 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001594 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001595 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001596 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001597 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001598 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001599 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001600 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001601 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 169 more...