Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Cyfres003 - Great Northern Railway Company (U.S.)
- Is-gyfres009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 76 mwy...
- EitemStruc001495 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001496 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001497 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001498 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001499 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001500 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001501 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001502 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- EitemStruc001503 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 267 mwy...