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...
- IratdarabStruc001651 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- IratdarabStruc001652 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- IratdarabStruc001653 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001654 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001655 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001656 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- IratdarabStruc001657 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001658 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001659 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 1%% több...