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...
- IratdarabStruc001442 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001443 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001444 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001445 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001446 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001447 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001448 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001449 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001450 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 1%% több...