Northern Pacific Engineering Drawing: Interlocking Tower at South Portal at Seattle, Washington, prepared in 1939. Burlington Northern File Number 4748, Reference Number 10102, Sheet 001.

Northern Pacific Engineering Drawing: Interlocking Control Building at Tacoma, Washington, prepared in 1963. Burlington Northern File Number 4705, Reference Number 10106, Sheet 002.

Northern Pacific Engineering Drawing: Interlocking Control Building at Tacoma, Washington, prepared in 1963. Burlington Northern File Number 4705, Reference Number 10106, Sheet 003.

Northern Pacific Engineering Drawing: Interlocking Control Building at Tacoma, Washington, prepared in 1963. Burlington Northern File Number 4705, Reference Number 10106, Sheet 001.

Northern Pacific Engineering Drawing: General Layout at Kanaskat, Washington, prepared in 1958. Burlington Northern File Number 5002, Reference Number 10105, Sheet 002.

Northern Pacific Engineering Drawing: Garage for Signal Department Truck at Pasco, Washington, prepared in 1955. Burlington Northern File Number 4650, Reference Number 10112, Sheet 001.

Northern Pacific Engineering Drawing: Garage for Section Truck at Missoula, Montana, prepared in 1961. Burlington Northern File Number 5082-1, Reference Number 10102, Sheet 001.

Northern Pacific Engineering Drawing: Floodlights at Yardley, Washington, prepared in 1959. Burlington Northern File Number 5089, Reference Number 10106, Sheet 001.

Northern Pacific Engineering Drawing: Floodlights at Pasco, Washington, undated. Burlington Northern File Number 4651, Reference Number 101.

Northern Pacific Engineering Drawing: Floodlights at Pasco, Washington, prepared in 1969. Burlington Northern File Number 4651, Reference Number 10104.