Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Short Tons, Not Seasonally Adjusted

Frequency:  Monthly

Data Are For Non-Revenue And Revenue Freight. Data For 1920-1943 Exclude Switching And Terminal Companies. Beginning July 1929, Reports Are Titled "Net Ton-Miles Per Loaded Car-Mile." Data, However, Are Comparable Throughout. Source: Data For 1918-January 1920: American Railway Association Annual Bulletin, 1922, P. 9. Data For 1920-1934: Interstate Commerce Commision, "Freight And Passenger Service Operating Statistics Of Class I Steam Railways In The United States". Data For 1935-1943: Icc, "Freight Train Performance Of Class I Steam Railways In The United States".

This NBER data series m03002a appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: m03002a