Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Number of Locomotives, Not Seasonally Adjusted

Frequency:  Annual

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