SVG map of the routes of constituent components of the Northern (New Hampshire) Railroad system in 1890 at the time of its lease to the Boston and Maine.
Legend

  Northern Railroad (Main Line)
  Northern Railroad (Bristol Branch) formerly Franklin and Bristol Railroad
  Concord and Claremont Railroad (Main Line) formerly Merrimac and Connecticut Rivers Railroad
  Concord and Claremont Railroad (Main Line) formerly Sugar River Railroad
  Concord and Claremont Railroad (Hillsborough Branch) formerly Contoocock River Railroad
  Peterborough and Hillsborough Railroad
Design
Constructed using OSM administrative boundaries and tracing the Northern lines described by Henry V. Poor in Poor's Manual of Railroads, 1874–75 (for the connection between the Merrimac and Connecticut Rivers Railroad and the Sugar River Railroad) and Poor's Manual of Railroads, 1888 (for all other railroads) using the following georeferenced USGS topographic maps in GeoTIFF format (accessed using TopoView):

USGS 1:62500-scale Quadrangle for Hanover, VT 1908
USGS 1:62500-scale Quadrangle for Mascoma, NH 1932
USGS 1:62500-scale Quadrangle for Cardigan, NH 1930
USGS 1:62500-scale Quadrangle for Mount Kearsarge, NH 1928
USGS 1:62500-scale Quadrangle for Penacook, NH 1927
USGS 1:62500-scale Quadrangle for Concord, NH 1927
USGS 1:62500-scale Quadrangle for Holderness, NH 1927
USGS 1:62500-scale Quadrangle for Claremont, NH 1929
USGS 1:62500-scale Quadrangle for Sunapee, NH 1907
USGS 1:62500-scale Quadrangle for Hillsboro, NH 1929
USGS 1:62500-scale Quadrangle for Peterboro, NH 1900
Projection: Albers Equal Area Conic Projection with standard parallels 29.5°N and 45.5°N, reference latitude 43.6856509°N, reference longitude 71.5775914°W.
Pipian (talk) (Uploads)