Railroad Archives Online
- D0027 - Timothy Miller Collection
- Ro`yxat003 - Great Northern Railway Company (U.S.)
- Ro`yxat-osti009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 158 more...
- Struc001577 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001578 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001579 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Struc001580 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Struc001581 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001582 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Struc001583 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- Struc001584 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001585 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 185 more...