Release: NBER Macrohistory Database
Source: Railroad Gazette Magazine
This NBER data series q02084a appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.
NBER Indicator: q02084a
National Bureau of Economic Research, Miles of Railroad Track Laid on Main Lines for United States [Q0284AUSQ376NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/Q0284AUSQ376NNBR, July 29, 2016.