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Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Indicator Switch, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet Z - 2 - 13 - 24, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gearing, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet Z - 2 - 10 - 4, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gear Detail, Bridge 9.6 - Columbia River, Vancouver, Washington, Line Segment 047, Milepost 9.31. Sheet Z - 2 - 10 - 12, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gear Detail, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 22 - 11, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gear and Detail, Bridge 8.8 - Oregon Slough, north of North Portland Junction, Oregon, Line Segment 047, Milepost 8.62. Sheet Z - 3 - 22 - 12, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gear and Detail, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 2 - 9, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gear and Detail, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 2 - 10, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gear and Detail, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 2 - 10A, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Gear and Detail, Bridge 5.1 - Willamette River, north of Willbridge, Oregon, Line Segment 047, Milepost 5.15. Sheet Z - 1 - 2 - 10, undated.

Spokane, Portland and Seattle Railway Engineering Drawing: Rail Lock Details, Bridge A62.7 - Clatskanie River, west of Clatskanie, Oregon, Line Segment 440, Milepost 62.67. Sheet NO - 263A, undated.