Release: NBER Macrohistory Database
Series Is Presented Here As Two Variables--(1)--Original Data, 1921-1937 (2)--Original Data, 1937-1943 Data Include Switching And Terminal Companies. Data For January 1937 Computed By NBER By Dividing December 1936 Plus January 1937 Figures By Two. Source: Interstate Commerce Commission, Motive Power And Car Equipment Of Class I Steam Railways.
This NBER data series m01257b appears on the NBER website in Chapter 1 at http://www.nber.org/databases/macrohistory/contents/chapter01.html.
NBER Indicator: m01257b
National Bureau of Economic Research, Total Number of Locomotives Assigned To Road Passenger Service for United States [M0157BUSM365NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M0157BUSM365NNBR, July 25, 2017.