Railroad Archives Online
- ArkivD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Underserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 90 mer...
- ObjektStruc001509 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001510 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001511 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001512 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001513 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001514 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001515 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001516 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1979
- ObjektStruc001517 - Great Northern Engineering Drawing, Cascade Tunnel at Berne, Washington, 1975
- 253 mer...