Release: NBER Macrohistory Database
Source: Interstate Commerce Commission, Statements M210 And M211, "Freight Train Performance"
This NBER data series m03070 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03070
National Bureau of Economic Research, Road Freight Locomotive Miles, Principal and Helper for United States [M03070USM417NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M03070USM417NNBR, July 22, 2019.