Data Are Given In Sources As "Percent Eastbound Of Total Loaded Freight Car-Miles." This Variable Was Computed By Deducting The Given Figure From 100. For The Period 1920-1934, The Item Subtracted From 100 Was "Percent Loaded East." Data Exclude Switching And Terminal Companies. Source: Data Were Computed By NBER From Interstate Commerce Commission Sources, Data For 1920-1934: "Freight And Passenger Service Operating Statistics Of Class I Steam Railways In The United States" ; Data For 1935-1942: "Freight And Train Performance Of Class I Steam Railways In The United States"
This NBER data series m03044 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03044
Release: NBER Macrohistory Database
National Bureau of Economic Research, Percent Westbound of Total Loaded Freight Car-Miles, Class I Railroads for United States [M03044USM156NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M03044USM156NNBR/, June 3, 2015.