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
- 185 more...
- ItemStruc001604 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001605 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001606 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001607 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001608 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001609 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001610 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001611 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001612 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 158 more...