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
- 24 more...
- ItemStruc001443 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001444 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001445 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001446 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001447 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001448 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001449 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001450 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001451 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 319 more...