Railroad Archives Online
- FondD0027 - Timothy Miller Collection
- Sorozat003 - Great Northern Railway Company (U.S.)
- Alsorozat009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 1%% több...
- IratdarabStruc001558 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001559 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001560 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001561 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001562 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001563 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001564 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001565 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001566 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 1%% több...