Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Millions of Net Ton-Miles, Not Seasonally Adjusted

Frequency:  Monthly

Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1931 (2)--Original Data, 1931-1939. Data Include General Merchandise, Livestock, Coal, Coke, Patent Fuels, And Other Minerals Shipped On Standard Gauge Railways. Before January 1932 The Data Are Based On Information Supplied By The Railroad Companies On The Basis Of Calender Months. Thereafter, Railroad Companies Only Supplied Information On Weekly Periods. Monthly Figures Were Obtained By Equating The Weekly Total To The Calendar Months. Days Of Weeks Not Ending Within The Calendar Month Were Included In The Following Months Total. No Data Were Available For December 25-31, 1938. The Entire Month Was Interpolated On The Basis Of The First 24 Days. Source: Ministry Of Transport, Railway Statistics, Number 14, January 1921 And Subsequent Monthly Issues.

This NBER data series m03003aa appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: m03003aa