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
- 70 more...
- Struc001489 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001490 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001491 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001492 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001493 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001494 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- Struc001495 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001496 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- Struc001497 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 273 more...