Release: NBER Macrohistory Database
Switching And Terminal Companies Are Excluded Through 1936. They Were Included Beginning In 1937. Data Are As Of December 31. Source: Computed By NBER By Adding Series (Locomotives Assigned To Freight And Passenger Service, Respectively).
This NBER data series a01273a appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: a01273a
National Bureau of Economic Research, Total Locomotives Assigned To Freight and Passenger Service, Class I Railroads for United States [A0173AUSA481NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/A0173AUSA481NNBR, July 20, 2019.