Railroad Archives Online
- FondsD0027 - Timothy Miller Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Teilserie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 182 mehr...
- ObjektStruc001601 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ObjektStruc001602 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001603 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ObjektStruc001604 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ObjektStruc001605 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001606 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ObjektStruc001607 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ObjektStruc001608 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ObjektStruc001609 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 161 mehr...