Release: NBER Macrohistory Database
Data Are Based On Reports From The Association Of American Railroads For Principal Nonagricultural Commodities As Derived From Shippers' Reports Of Actual And Expected Car Needs. Data For 1927-1939 Cover Sixteen Components; For The First-Third Quarter Of 1946 Cover Seventeen Components; For The Fourth Quarter Of 1946 To 1958 Cover Nineteen Components. Source: G.H. Moore, Business Indicators, Vol. 2, NBER, Pp. 166-167
This NBER data series q16098 appears on the NBER website in Chapter 16 at http://www.nber.org/databases/macrohistory/contents/chapter16.html.
NBER Indicator: q16098
National Bureau of Economic Research, Diffusion Index, Freight Car loadings, Nineteen Commodity Groups, Four Quarter Span for United States [Q16098USQ509NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/Q16098USQ509NNBR, July 29, 2016.