Burlington Northern Engineering Drawing: Timber Drain Boxes, Drainage Boxes for Tunnels, Line Segment 999. Sheet 238 - 3016 - 32, undated.

Camas Prairie Railroad Engineering Drawing: Renew Timber Lining, Tunnel #3, Idaho, Line Segment 460, Milepost 22.01. Sheet 446 - 59, undated.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1956. Burlington Northern File Number 9531-9, Reference Number 10102.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1956. Burlington Northern File Number 9531, Reference Number 10105, Sheet 001.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1956. Burlington Northern File Number 9531, Reference Number 10105.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1971. Burlington Northern File Number 9531, Reference Number 10106, Sheet 002.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1971. Burlington Northern File Number 9531, Reference Number 10106, Sheet 001.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1975. Burlington Northern File Number 9531-9, Reference Number 10104.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1975. Burlington Northern File Number 9531-9, Reference Number 10104.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1975. Burlington Northern File Number 9531-9, Reference Number 10104.