Northern Pacific Engineering Drawing: Roundhouse at Helena, Montana, prepared in 1960. Burlington Northern File Number 4615, Reference Number 10103, Sheet 003.

Northern Pacific Engineering Drawing: Roundhouse at Helena, Montana, prepared in 1960. Burlington Northern File Number 4615, Reference Number 10103, Sheet 002.

Northern Pacific Engineering Drawing: Roundhouse at Helena, Montana, prepared in 1961. Burlington Northern File Number 4615, Reference Number 10109, Sheet 5-A.

Northern Pacific Engineering Drawing: Roundhouse at Helena, Montana, prepared in 1963. Burlington Northern File Number 4616, Reference Number 10106, Sheet 002.

Northern Pacific Engineering Drawing: Sand Facilities Dust Arresting Vent at Helena, Montana, prepared in 1953. Burlington Northern File Number 4618, Reference Number 10110.

Northern Pacific Engineering Drawing: Sand Facilities Piping and Electrical at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10104.

Northern Pacific Engineering Drawing: Sand Facilities at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10104.

Northern Pacific Engineering Drawing: Sand Facilities Foundation Details at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10103.

Northern Pacific Engineering Drawing: Sand Facilities at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10104.

Northern Pacific Engineering Drawing: Sand Facilities at Helena, Montana, prepared in 1957. Burlington Northern File Number 7752-D, Reference Number 10104.