Release: NBER Macrohistory Database
Data For 1920-1934 Are Daily Averages; 1935-1942 Are End-Of-Month. Data For 1920-1936 Exclude Class I Switching And Terminal Companies; 1937-1942 Include Switching And Terminal Companies. Data Fora July-August 1921 And August 1922 Exclude The Chicago And Alton R.R. Data Fpr 1920-1934 Are Computed By NBER From Published Figures On Total Freight Cars On Line And Percent Freight Cars On Line, Serviceable. Source: Interstate Commerce Commission, Data For 1920-1934: Freight And Passenger Service Operating Statistics Of Class I Steam Railways In The U.S. Data For 1935-1943: Motive Power And Car Equipment Of Class I Steam Railways In The U.S.
This NBER data series m01254 appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01254
National Bureau of Economic Research, Serviceable Freight Cars on Line, Class I Railroads for United States [M01254USM559NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M01254USM559NNBR, August 25, 2016.