Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Millions of Dollars, Not Seasonally Adjusted

Frequency:  Monthly

Data Exclude Switching And Terminal Companies From 1907-1909 And 1932-1943. Revised Data Are Used For Monthly Figures, 1907-1960. Thereafter No Revised Monthly Figures Are Shown Because Data Only Published Quarterly From 1962 On. Beginning In 1962, Only Quarterly Data Are Published By The Icc; The Monthly Figures Presented Were Derived By NBER. Source: Interstate Commerce Commision, "Operating Revenues And Operating Expenses Of Class I Steam Railways In The United States", Monthly (Called "Class I Railroads" In The Title After November 1956.)

This NBER data series m03040 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: m03040