Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Percent, Not Seasonally Adjusted

Frequency:  Monthly

Data For 1920-1936 Exclude Class I Switching And Terminal Companies; 1937-1942 Include Switching And Terminal Companies. Data For 1920-1934: Are Based On Daily Average Data; 1935-1942 Are Based On End-Of-Month Data. Source: Data Are Computed From Figures Found In Interstate Commerce Commission, Freight And Passenger Service Operating Statistics Of Class I Steam Railways In The U.S. For 1920-1934; Motive Power And Car Equipment Of Class I Steam Railways In The U.S For 1935-1942.

This NBER data series m01255 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.

NBER Indicator: m01255