Great Northern Engineering Drawing: Line Change Tool House at Libby, Montana, prepared in 1969. Burlington Northern File Number 9656-1, Reference Number 10104.

Great Northern Engineering Drawing: Line Change Tool House at Libby, Montana, prepared in 1969. Burlington Northern File Number 9655-1, Reference Number 10104.

Great Northern Engineering Drawing: Line Change Section House at Libby, Montana, prepared in 1970. Burlington Northern File Number 9654-1, Reference Number 10109.

Great Northern Engineering Drawing: Line Change at Stryker, Montana, prepared in 1969. Burlington Northern File Number 9653-2, Reference Number 10104.