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
- 59 more...
- Struc001478 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- Struc001479 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001480 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- Struc001481 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- Struc001482 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- Struc001483 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- Struc001484 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1948
- Struc001485 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- Struc001486 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- 284 more...