Release: NBER Macrohistory Database
Source: Data For 1920-1931: Ministry Of Transport, "Railway Statistics". Data For 1931-1939: Computed By NBER By Dividing Series 03078 (Freight Train-Miles) By Series 03080 (Freight Train-Hours). Data For 1947-1952: From NBER Files.
This NBER data series m03081 appears on the NBER website in Chapter 3 at http://www.nber.org/databases/macrohistory/contents/chapter03.html.
NBER Indicator: m03081
National Bureau of Economic Research, Freight Train-Miles Per Train-Hour for Great Britain [M03081GBM615NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/M03081GBM615NNBR, August 30, 2016.