Data Include Engine And Brake And Loaded And Empty. 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 m03085 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03085
Release: NBER Macrohistory Database
National Bureau of Economic Research, Total Coaching Train-Miles Including London Railways for Great Britain [M03085GBM227NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M03085GBM227NNBR/, October 9, 2015.