Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Teilserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 77 mehr...
- ObjektStruc001496 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001497 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001498 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001499 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001500 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001501 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001502 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ObjektStruc001503 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001504 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 266 mehr...