Railroad Archives Online
- SafnD0027 - Timothy Miller Collection
- Skjalaflokkur003 - Great Northern Railway Company (U.S.)
- Undirskjalaflokkur009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 221 more...
- EiningStruc001660 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- EiningStruc001661 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- EiningStruc001662 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EiningStruc001663 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EiningStruc001664 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EiningStruc001665 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- EiningStruc001666 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- EiningStruc001667 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- EiningStruc001668 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 122 more...