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...
- IratdarabStruc001522 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001523 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, undated
- IratdarabStruc001524 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001525 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- IratdarabStruc001526 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001527 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001528 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001529 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- IratdarabStruc001530 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 1%% több...