Northern Pacific Engineering Drawing: Sand Facilities at Helena, Montana, prepared in 1960. Burlington Northern File Number 4618, Reference Number 10103, Sheet S-1.

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 at Helena, Montana, prepared in 1957. Burlington Northern File Number 7752-D, Reference Number 10104.

Northern Pacific Engineering Drawing: Sand Facilities Storage and Dispensing Silo at Helena, Montana, prepared in 1957. Burlington Northern File Number 4618, Reference Number 10103.

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

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