Railroad Archives Online
- ArquivoD0027 - Timothy Miller Collection
- Série003 - Great Northern Railway Company (U.S.)
- Subsérie009 - Engineering Records
- 008 - Physical plant drawing
- 008 - Tunnels
- 224 mais...
- ItemStruc001663 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001664 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001665 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001666 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1955
- ItemStruc001667 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001668 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001669 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001670 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001671 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- 119 mais...