Release: NBER Macrohistory Database
The Six Railroads Are--(1)--Illinois Central (2)--Chicago And Alton (3)--Chicago And Rock Island (4)--Chicago, Burlington, And Quincy (5)--Chicago And Northwestern (6)--Chicago, Milwaukee And Saint Paul. Data For 1889-1890 Were Computed By Summing The Ton-Miles Of The Six 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 a03003k appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: a03003k
National Bureau of Economic Research, Freight Ton-Miles, Six Railroads for United States [A0303KUSA454NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/A0303KUSA454NNBR, July 25, 2016.