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.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1979. Burlington Northern File Number 9531-9, Reference Number 10104.

Great Northern Engineering Drawing: Cascade Tunnel at Berne, Washington, prepared in 1980. Burlington Northern File Number 9531, Reference Number 10108.