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.

Great Northern Engineering Drawing: Cascade Tunnel Crosscuts between Main Tunnel and Pioneer Tunnel at Scenic, Washington, prepared in 1956. Burlington Northern File Number 9531, Reference Number 10106.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, prepared in 1948. Burlington Northern File Number 9531, Reference Number 10102.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, prepared in 1950. Burlington Northern File Number 9531, Reference Number 10104.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, prepared in 1951. Burlington Northern File Number 9531, Reference Number 10102.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, prepared in 1954. Burlington Northern File Number 9531, Reference Number 10106.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, prepared in 1954. Burlington Northern File Number 9531, Reference Number 10105.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, prepared in 1954. Burlington Northern File Number 9531, Reference Number 10106.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, prepared in 1954. Burlington Northern File Number 9531, Reference Number 10104.