Data Include Switching And Terminal Companies Until 1933. Data Include Overtime Paid At Pro-Rata As Well As Punitive Rates. Source: Interstate Commerce Commission, Wage Statistics Of Class I Steam Railroads In The U.S.
This NBER data series m08153 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08153
Release: NBER Macrohistory Database
National Bureau of Economic Research, Overtime Man-Hours Paid for All Employees on Hourly Basis, Class I Railroads for United States [M08153USM420NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08153USM420NNBR, May 24, 2016.