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...
- IratdarabStruc001475 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001476 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- IratdarabStruc001477 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001478 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- IratdarabStruc001479 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001480 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- IratdarabStruc001481 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- IratdarabStruc001482 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- IratdarabStruc001483 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- 1%% több...