Data For 1920-July 1921 Cover Controlled Railways Only. Data For 1920-1929 Exclude Receipts From Collection And Delivery. During Processing It Was Discovered That Monthly And Quarterly Figures For 1931 As Provided By NBER Do Not Agree, But Data Have Not Been Changed. The Annual Figure Provided Here Was Computed From Monthly Data. Source: Ministry Of Transport, "Railway Statistics", Successive Issues.
This NBER data series m03084 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03084
Release: NBER Macrohistory Database
National Bureau of Economic Research, Freight Train Receipts, All Freight for Great Britain [M03084GBM590NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M03084GBM590NNBR/, July 30, 2015.