Data For July 1921 Through December 1932 Include Switching And Terminal Companies; Data For January 1933 Through September 1942 Exclude Them. Source: Interstate Commerce Commission, Bureau Of Labor Statistics, And National Bureau Of Economic Research, The Sum Of"Computed-Total Time Actually Worked By All Employees And Constructive Allowances For Transportation Trains And Engine-Wages Statistics For The Class I Steam Railroads In U.S.
This NBER data series m08157 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08157
Release: NBER Macrohistory Database
National Bureau of Economic Research, Total Man-Hours Worked-All Employees On Hourly Basis, Class I Steam Railroads (Including Switching and Terminal Companies). for United States [M08157USM597NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08157USM597NNBR/, December 1, 2015.