Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Millions of Current Dollars, Not Seasonally Adjusted

Frequency:  Annual

Source: Interstate Commerce Commission, "Statistics Of Railways, " 1887/8, 1888/9, 1913, 1914, 1926, P. C, 1928, P.Lxxviii; 1935, P.S-113.

This NBER data series a02084ca appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.

NBER Indicator: a02084ca