Data For 1882-1911 Were Checked By Dividing Freight Earnings By Ton-Miles. The Figure For 1894 Was Given As .864, Which Does Not Check; Therefore It Was Corrected By NBER To .852. Fiscal Years Of Reporting Companies Vary. Source: Poor'S Manual Of Railroads, 1890, Pp. Xiii-Xiv; 1891, Pp. Xiii; 1900, P. 1; 1905, P. Ii; 1910, Pp. Cix, Cvii; 1912, Pp. Cxxxiv-Cxlviii.
This NBER data series a03003d appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: a03003d
Release: NBER Macrohistory Database
National Bureau of Economic Research, Revenue Per Freight Ton-Mile, All Railroads for United States [A0303DUSA259NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A0303DUSA259NNBR/, July 2, 2015.