Railroad Archives Online
- CollectionD0027 - Timothy Miller Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1009 - Engineering Records
- Subseries Level 2008 - Physical plant drawing
- Subseries Level 3008 - Tunnels
- 122 more...
- ItemStruc001541 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001542 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001543 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1964
- ItemStruc001544 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001545 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1963
- ItemStruc001546 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1956
- ItemStruc001547 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001548 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- ItemStruc001549 - Great Northern Engineering Drawing, Cascade Tunnel, Washington, 1957
- 221 more...