Data Were Computed By Adding Ton-Miles For The Six Railroads And The Ton-Miles For The Seven Railroad.. Data For 1887-1890 Were Computed By Adding The Ton-Miles Of The Thirteen Individual Railroads. Source: Poor'S Manual Of Railroads, 1888, Pp. Xxvii-Xxix; 1889, P. Viii; And Volumes For 1890 And 1891
This NBER data series a03003g appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: a03003g
Release: NBER Macrohistory Database
National Bureau of Economic Research, Freight Ton-Miles, Thirteen Railroads for United States [A0303GUSA253NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0303GUSA253NNBR, February 12, 2016.