Data For "Revenue Ton-Miles " Exclude Switching And Terminal Companies. Data For "Coal Consumption" Exclude These Components From 1920-1936; Include Them Thereafter. Source: Computed By NBER By Dividing Series 03037 (Revenue Ton-Miles) By Series 03047 (Tons Of Coal Or Equivalent Consumption In Road Freight Service); Data Are From Interstate Commerce Commision Sources.
This NBER data series m03048 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03048
Release: NBER Macrohistory Database
National Bureau of Economic Research, Revenue Ton-Miles Per Ton of Coal Consumed In Freight Service, Class I Railroads for United States [M03048USM611NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M03048USM611NNBR/, August 29, 2015.