Great Northern Blueprint Number 1333-9-4, Great Northern New Cascade Tunnel Section Looking East, 1926. Other subject categories: Drawing

Great Northern Blueprint Number 1333-9-7, Great Northern Proposed Section of the New Cascade Tunnel, 1926. Other subject categories: Drawing

Great Northern Blueprint Number 1333-9-6, Great Northern New Cascade Tunnel Cross Sections, 1926. Other subject categories: Drawing

Great Northern Blueprint Number 1333-9-5, Great Northern Details of Trolley Suports in the New Cascade Tunnel, 1926. Other subject categories: Drawing

Great Northern Engineering Drawing: Cascade Tunnel, Washington, undated. Burlington Northern File Number 9531, Reference Number 101.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, undated. Burlington Northern File Number 9531, Reference Number 101.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, undated. Burlington Northern File Number 9531, Reference Number 101.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, undated. Burlington Northern File Number 9531, Reference Number 101.

Great Northern Engineering Drawing: Cascade Tunnel, Washington, undated. Burlington Northern File Number 9531, Reference Number 101.