Release: NBER Macrohistory Database
Data Include Unserviceable Units. Source: Computed By NBER By Dividing Series 03003 (Revenue Ton-Miles) By Series 01253 (Total Freight Cars On Line).
This NBER data series m03067 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03067
National Bureau of Economic Research, Revenue Ton-Miles Per Freight Car on Line for United States [M03067USM604SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M03067USM604SNBR, February 27, 2017.