Release: NBER Macrohistory Database
Series Is Presented Here As Two Variables--(1)--Original Data, 1920-1939 (2)--Seasonally Adjusted, 1944-1952. Source: Computed By NBER By Dividing Series (Net Ton-Miles) By Series (Loaded Wagon-Miles).
This NBER data series q03077 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: q03077
National Bureau of Economic Research, Average Wagon Load for Great Britain [Q03077GBQ464SNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/Q03077GBQ464SNBR, July 23, 2017.