Release: NBER Macrohistory Database
These Data Were Computed By NBER By Dividing Net Revenue (NBER Series 09026), By The Traffic Unit Series. Source: Thor Hultgren, American Transportation In Prosperity And Depression, NBER, 1948, Chapter 3.
This NBER data series m09049 appears on the NBER website in Chapter 9 at http://www.nber.org/databases/macrohistory/contents/chapter09.html.
NBER Indicator: m09049
National Bureau of Economic Research, Net Revenue from Railway Operations Per Traffic Unit, Class I Railroads, Interstate Commerce Commission for United States [M09049USM259SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M09049USM259SNBR, March 29, 2017.