Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Cyfres003 - Great Northern Railway Company (U.S.)
- Is-gyfres009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 201 mwy...
- EitemStruc001620 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1980
- EitemStruc001621 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1956
- EitemStruc001622 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1963
- EitemStruc001643 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- EitemStruc001644 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001645 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- EitemStruc001646 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EitemStruc001647 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1950
- EitemStruc001648 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 142 mwy...