Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Car-Miles per Train-Mile, Not Seasonally Adjusted

Frequency:  Monthly

Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1930 (2)--Original Data, 1930-1943 Coverage Includes Motor-Car Train-Miles Not Previously Reported. Source: NBER Derived Data By Dividing Series (Passenger Car-Miles) By (Passenger Train-Miles).

This NBER data series m03061b appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: m03061b