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...
- IratdarabStruc001570 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001571 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001572 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001573 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001574 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001575 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001576 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001577 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001578 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 1%% több...