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...
- IratdarabStruc001492 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001493 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001494 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- IratdarabStruc001495 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001496 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001497 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001498 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001499 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001500 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 1%% több...