Release: NBER Macrohistory Database
Data Were Obtained By NBER From The Latest Manual In Which They Were Available. Source: National Bureau Of Economic Research; Poor'S "Manual Of Railroads"
This NBER data series a02083b appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.
NBER Indicator: a02083b
National Bureau of Economic Research, Increases in Railroad Mileage for Maine, New Hampshire, Vermont, Massachusetts, Connecticut, Rhode Island, New York, New Jersey, Pennsylvania [A0283BUSA374NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/A0283BUSA374NNBR, March 26, 2017.