Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Thousands of Train-Hours, Not Seasonally Adjusted

Frequency:  Monthly

Data Exclude Switching And Terminal Companies. The Unadjusted Figures For January-March 1920 Were Computed By NBER. Beginning In 1935, The Source Title Includes The Statement That "Train-Switching Hours At Way Stations" Are Included In The Data. Source: Interstate Commerce Commission, Data For 1920-1934: "Freight And Passenger Service Operating Statistics Of Class I Steam Railways In The United States"; Data For 1935-1943: "Freight Train Performance Of Class I Steam Railways In The United States"

This NBER data series m03049 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: m03049