Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Billions of Ton-Miles, Seasonally Adjusted

Frequency:  Monthly

Data For 1907-1914 And 1916-1924 Are Identical To The Data In Series "Revenue And Non-Revenue Net Ton-Miles Of Freight Hauled" And Could Be Considered Additional Variable Segments. Data At Least Until 1909 Are Based On A Two Month Moving Average Placed In The Second Month. Source: Babson Statistical Organization, Inc.

This NBER data series m03003 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: m03003