Railroad Archives Online
- ArkivD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 221 mer...
- ObjektStruc001660 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ObjektStruc001661 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ObjektStruc001662 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001663 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001664 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001665 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ObjektStruc001666 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ObjektStruc001667 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001668 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 122 mer...