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The SP&S Collection encompasses 6,286 documents relating to SP&S operations and indexed by station. Documents include correspondence, maps, leases, deeds, authorization documents, operating agreements and other document types for the period between 1890 and 1987.

Spokane, Portland and Seattle Railway Engineering Drawing: Wiring Diagram/Torque Curve, Bridge E126.9 - Willamette River, south of Harrisburg, Oregon, Line Segment 442, Milepost 125.99. Sheet V - 4 - 5, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Wiring Diagram, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet Z - 2 - 13 - 16, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Wiring Diagram Switchboard/Lights/Motors, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 25 - 11, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Wiring Diagram Switchboard Lights/Motor, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 5 - 27, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Wiring Diagram Swing Motor/Lock, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet DWEB101, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Wiring Diagram Rail Lock/Motor, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 5 - 26, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Wiring Diagram for Circuit, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet EB 102 - 2, undated.