Plat Map of Northern Pacific facilities at Helena, Montana, June 14, 1917, Sheet Number 4, Line Segment 713, showing the Northern Pacific mainline, Great Northern interchange.

Plat Map of Northern Pacific facilities at Helena, Montana, June 14, 1917, Sheet Number 2, Line Segment 713, showing the Northern Pacific mainline, Great Northern interchange.

Plat Map of Northern Pacific facilities at Helena, Montana, June 14, 1917, Sheet Number 1, Line Segment 713, showing the Northern Pacific mainline, Great Northern interchange.

Plat Map of Great Northern, Northern Pacific facilities at Helena, Montana, December 1, 1915, Drawing Number 31079-1, Sheet Number 1, Line Segment 713, showing the Great Northern mainline, Northern Pacificÿyard.

Plat Map of Great Northern, Northern Pacific facilities at Helena, Montana, December 1, 1915, Drawing Number 31079-1, Sheet Number 2, Line Segment 713, showing the Great Northern mainline, Northern Pacific yard.

Plat Map of Great Northern facilities at Helena, Montana, August 1, 1960, Sheet Number 2, Line Segment 713, showing the Great Northern industry spurs, Northern Pacific yard.

Plat Map of Great Northern facilities at Helena, Montana, August 1, 1960, Sheet Number 1, Line Segment 713, showing the Great Northern right of way, Northern Pacific yard.

Plat Map of Great Northern facilities at Helena, Montana, August 1, 1960, Sheet Number 3, Line Segment 713, showing the Great Northern-Northern Pacific interchange, spurs.

Plat Map of Great Northern facilities at Helena, Montana, August 1, 1960, Sheet Number 1, Line Segment 713, showing the Great Northern, Northern Pacific mainlines, industry spurs.

Plat Map of Great Northern facilities at Helena, Montana, August 1, 1960, Sheet Number 3, Line Segment 713, showing the Great Northern branch, Northern Pacific yard.