Data For Passenger-Miles Exclude Switching And Terminal Companies Throughout; Data For Coal Consumed Exclude These Companies For 1920-1936, But Include Them Thereafter. Source: Interstate Commerce Commission, Data For 1920-1935: Derived By NBER From "Revenue Traffic Statistics Of Class I Steam Railways In The United States" (For Revenue Passenger-Miles) And "Freight And Passenger Service Operating Statistics Of Class I Steam Railways In The United States" (For Coal Consumed). Data For 1936-1942: "Fuel And Power For Locomotives And Rail Motor Carriers Of Class I Steam Railways In The United States."
This NBER data series m03054 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03054
Release: NBER Macrohistory Database
National Bureau of Economic Research, Passenger-Miles Per Ton of Coal Consumed In Passenger Service, Class I Railroads for United States [M03054USM503NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M03054USM503NNBR/, August 2, 2015.