Source: National Bureau of Economic Research  

Release: NBER Macrohistory Database  

Units:  Miles, Not Seasonally Adjusted

Frequency:  Annual

Content Is "Net Increase Of Mileage Of All Railroads In The U.S. In The Calendar Year," An Increase Being Defined As "First Track Mileage Operated." Source: Poor'S Manual Of Railroads, 1912.

This NBER data series a02082 appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.

NBER Indicator: a02082