Release: NBER Macrohistory Database
Source: Interstate Commerce Commission, Data For 1920-1923: "Statistics Of Railways", 1920, P. Xxxiv; 1921, P. Cix; 1922, P. Ciii; 1923, P.Xciv; Data For 1924-1943: "Freight Commodity Statistics: Quarterly Reports"
This NBER data series q03069 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: q03069
National Bureau of Economic Research, Revenue Freight Tons Originated, Less Than Carload for United States [Q03069USQ605NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/Q03069USQ605NNBR, January 15, 2021.