Great Northern sand car X2956 in Interbay, Washington, undated. Photograph by Wade Stevenson.

Great Northern Engineering Drawing: Yard Office at Interbay, Washington, undated. Burlington Northern File Number 8738-4, Reference Number 101.

Great Northern Engineering Drawing: Yard Office at Interbay, Washington, undated. Burlington Northern File Number 8738-5, Reference Number 101.

Great Northern Engineering Drawing: Yard Office at Interbay, Washington, prepared in 1974. Burlington Northern File Number 9721-E5, Reference Number 10105.

Great Northern Engineering Drawing: Yard Office at Interbay, Washington, prepared in 1974. Burlington Northern File Number 9721, Reference Number 10108.

Great Northern Engineering Drawing: Yard Office at Interbay, Washington, prepared in 1974. Burlington Northern File Number 9721, Reference Number 10109.

Great Northern Engineering Drawing: Yard Office at Interbay, Washington, prepared in 1974. Burlington Northern File Number 9721, Reference Number 10108.

Great Northern Engineering Drawing: Yard Office Addition, at Balmer Yard at Interbay, Washington, prepared in 1974. Burlington Northern File Number 9721-12, Reference Number 10105.

Great Northern Engineering Drawing: Yard Office Addition, at Balmer Yard at Interbay, Washington, prepared in 1974. Burlington Northern File Number 9721-13, Reference Number 10107.