Railroad Archives Online
- FondiD0027 - Timothy Miller Collection
- Serija003 - Great Northern Railway Company (U.S.)
- Podserija009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 66 more...
- DokumentStruc001485 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1954
- DokumentStruc001486 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- DokumentStruc001487 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001488 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- DokumentStruc001489 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001490 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001491 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001492 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- DokumentStruc001493 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 277 more...