Plat Map of Northern Pacific facilities at Townsend, Montana, August 15, 1929, Sheet Number 2, Line Segment 41, showing the Billings-Helena line.

Plat Map of Northern Pacific facilities at Townsend, Montana, August 15, 1929, Sheet Number 4, Line Segment 41, showing the Billings-Helena line.

Plat Map of Northern Pacific facilities at Townsend, Montana, August 15, 1929, Sheet Number 5, Line Segment 41, showing the Billings-Helena line.

Plat Map of Northern Pacific facilities at Townsend, Montana, August 15, 1929, Sheet Number 1, Line Segment 41, showing the Billings-Helena line.

Plat Map of Northern Pacific facilities at Townsend, Montana, August 15, 1929, Sheet Number 3, Line Segment 41, showing the Billings-Helena line.

Northern Pacific Engineering Drawing: Walk/Railing Detail, Bridge 206 (259) - Missouri River, west of Townsend, Montana, Line Segment 041, Milepost 206.3. Sheet 1066 - 2, undated.

Northern Pacific Engineering Drawing: Walk Details, Bridge 206 (159) - Missouri River, west of Townsend, Montana, Line Segment 041, Milepost 206.3. Sheet 441 - 2, undated.