Data Include Switching And Terminal Companies Until 1933 Source: Computed By NBER From Series (Total Straight Time Hours Worked Per Month, All Employees On Hourly Basis) And Series (Total Number Of Employees On Hourly Basis).
This NBER data series m08155 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08155
Release: NBER Macrohistory Database
National Bureau of Economic Research, Straight Time Hours Worked Per Month, Per Employee, All Employees On Hourly Basis, Class I Railroads for United States [M08155USM065NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08155USM065NNBR/, November 25, 2015.