For Method Of Computation And Types Of Wage Earners Included See The Description Of Series In The Source. Source: Computed By The National Industrial Conference Board From Data In "Wage Statistics", Interstate Commerce Commission.
This NBER data series m08044 appears on the NBER website in Chapter 8 at http://www.nber.org/databases/macrohistory/contents/chapter08.html.
NBER Indicator: m08044
Release: NBER Macrohistory Database
National Bureau of Economic Research, Average Weekly Earnings, First Class Railroad Employees, Train and Engine Service for United States [M08044USM052NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M08044USM052NNBR/, July 28, 2015.