Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-15733, Reference Number 10105, Sheet 009.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-15733, Reference Number 10105, Sheet 012.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-15733, Reference Number 10105, Sheet 015.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D754, Reference Number 10102, Sheet 001.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D754, Reference Number 10102, Sheet 002.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D754, Reference Number 10102, Sheet 004.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D754, Reference Number 10102, Sheet 005.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D754, Reference Number 10102, Sheet 006.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D754, Reference Number 10101, Sheet 008.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D737, Reference Number 10101, Sheet 005.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D737, Reference Number 10101, Sheet 005.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-1592-1, Reference Number 10102.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number 973D737, Reference Number 10102, Sheet 004.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-7617, Reference Number 10102.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-21054, Reference Number 10105.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-15727, Reference Number 10102, Sheet 008.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1971. Burlington Northern File Number PD-15727, Reference Number 10102, Sheet 009.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1970. Burlington Northern File Number PD-15733, Reference Number 10105, Sheet 017.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1969. Burlington Northern File Number PD-15733, Reference Number 10110, Sheet 001.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1968. Burlington Northern File Number 973D737, Reference Number 10109, Sheet 003.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1968. Burlington Northern File Number TWIN MEADOWS,MT., Reference Number 10110.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1967. Burlington Northern File Number E-53-34-5, Reference Number 10105.

Great Northern Engineering Drawing: Flathead Tunnel Diesel Fuel Storage for Generator at Flathead Tunnel, Montana, prepared in 1966. Burlington Northern File Number 3A-400-35, Reference Number 10111.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1966. Burlington Northern File Number E-53-33-82, Reference Number 10102.

Great Northern Engineering Drawing: Flathead Tunnel, Montana, prepared in 1966. Burlington Northern File Number E-53-33-82, Reference Number 10101.