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I found old USGS maps of Southern NH at the State (socialized I might add) University in Durham, NH.. There were railroad tracks on the circa 1900 maps along almost every stream. Your local town assessor’s office might have ROW on the town tax maps. There are also sources of information in the advertising section of Trains magazine.
In New Hampshire the railroad ROWs that were purchased with the aid of State eminent domain legislation have to revert to the State if the railroad abandons the line. Most of the old ROWs in NH are intact although some are buried under pavement. I suspect that acquiring a modern transport ROW for a commuter RR would not be any more difficult that obtaining one for a road. Railroad ROW vary in size from 20 ft for the “Maine 2 footers “ to 1/4 mile for multi track freight RRs. The reduced ROW requirement is a reason for investigating the use of narrow gage rail for new commuter transport