Great Northern Engineering Drawing: Gas Engine Pipe Connections, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 199 - 2449 - 339, undated.

Great Northern Engineering Drawing: Friction Block - Gas Engine, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 389, undated.

Great Northern Engineering Drawing: End Lock Circuit Control, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 381, undated.

Great Northern Engineering Drawing: Encase Brackets 17 and 18, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 402, undated.

Great Northern Engineering Drawing: Encase - Brackets 2 and 3, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 473, 1949.

Great Northern Engineering Drawing: Diagram Electrical Connections, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 332, undated.

Great Northern Engineering Drawing: Details of Control Stand, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 199 - 2449 - 337, undated.

Great Northern Engineering Drawing: Details Mitered Rails, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 400, undated.

Great Northern Engineering Drawing: Details Frame Span - Machinery, Bridge 4 - Salmon Bay, Ballard, Washington, Line Segment 050, Milepost 6.3. Sheet 198 - 2449 - 486, undated.