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
- 35 more...
- ItemStruc001454 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001455 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001456 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001457 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001458 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001459 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001460 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001461 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001462 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 308 more...