Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Cyfres003 - Great Northern Railway Company (U.S.)
- Is-gyfres009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 18 mwy...
- EitemStruc001437 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001438 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001439 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001440 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001441 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- EitemStruc001442 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001443 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001444 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001445 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 325 mwy...