Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Cyfres003 - Great Northern Railway Company (U.S.)
- Is-gyfres009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 120 mwy...
- EitemStruc001539 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- EitemStruc001540 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- EitemStruc001541 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- EitemStruc001542 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- EitemStruc001543 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- EitemStruc001544 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001545 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1963
- EitemStruc001546 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001547 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 223 mwy...