Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Thousands of Cars per Week, Not Seasonally Adjusted

Frequency:  Monthly

Data Are Derived As Averages Of 4 Or 5 Weekly Figures For The Month; Weeks Ending On The 1St, 2Nd, And 3Rd Day Of A Month Are Included In The Preceding Month. The Weekly Carloadings Are Usually Revised One Year After They Were First Published (In Rare Cases A Second Revision Is Shown Two Years After The Original Figure). All Revisions Have Been Accounted For In The Data. Source: Association Of American Railroads, Data For 1918-1921: Annual Bulletin, Issues Of 1922-1925; Data For 1922-1974: "Revenue Freight Loaded And Received From Connections", Weekly Publication

This NBER data series m03002 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.

NBER Indicator: m03002