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...
- IratdarabStruc001552 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- IratdarabStruc001553 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- IratdarabStruc001554 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1970
- IratdarabStruc001555 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- IratdarabStruc001556 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- IratdarabStruc001557 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 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
- 1%% több...