Northern Pacific Engineering Drawing: Yard Office and Tower at Yardley, Washington, prepared in 1983. Burlington Northern File Number 12032, Reference Number 10107.

Northern Pacific Engineering Drawing: Yard Office and Tower at Yardley, Washington, prepared in 1984. Burlington Northern File Number 12033, Reference Number 10111.

Northern Pacific Engineering Drawing: Yard Office and Tower at Yardley, Washington, prepared in 1984. Burlington Northern File Number 12033, Reference Number 10111, Sheet 001.

Northern Pacific Engineering Drawing: Yard Office and Tower at Yardley, Washington, prepared in 1984. Burlington Northern File Number 12033, Reference Number 10111.

Northern Pacific Engineering Drawing: Yard Office at Yardley, Washington, prepared in 1956. Burlington Northern File Number 5088, Reference Number 10110, Sheet 01A.

Northern Pacific Engineering Drawing: Yard Office at Yardley, Washington, prepared in 1956. Burlington Northern File Number 5088, Reference Number 10108, Sheet 005.

Northern Pacific Engineering Drawing: Yard Office at Yardley, Washington, prepared in 1957. Burlington Northern File Number 5088, Reference Number 10112, Sheet 002.

Northern Pacific Engineering Drawing: Yard Office at Yardley, Washington, prepared in 1958. Burlington Northern File Number 5088, Reference Number 10108, Sheet 004.

Northern Pacific Engineering Drawing: Yard Office at Yardley, Washington, prepared in 1958. Burlington Northern File Number 5088, Reference Number 10108, Sheet 006.

Northern Pacific Engineering Drawing: Yard Office at Yardley, Washington, prepared in 1959. Burlington Northern File Number 5088, Reference Number 10108, Sheet 001.