Spokane, Portland, and Seattle Railway Engineering Drawing: Interlocking and Telegraph Office Building at Willbridge, Oregon, prepared in 1945. Burlington Northern File Number 1528, Reference Number 10107.

Spokane, Portland, and Seattle Railway Engineering Drawing: Interlocking and Telegraph Office Building at Willbridge, Oregon, undated. Burlington Northern File Number RS-275, Reference Number 101.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number 5129, Reference Number 10110, Sheet 008.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number PQ-287, Reference Number 10110.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number PQ-287, Reference Number 10108.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number PQ-287, Reference Number 10108.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number PQ-287, Reference Number 10108.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number 5129, Reference Number 10110, Sheet 007.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number PQ-287, Reference Number 10108.

Spokane, Portland, and Seattle Railway Engineering Drawing: Yard Office at Willbridge, Oregon, prepared in 1953. Burlington Northern File Number PQ-287, Reference Number 10108.