Mileage Initiated Computed By NBER By Subtracting Mileage Under Construction On Dec. 31 Of Previous Year From Corresponding Data For Dec. 31 Of Given Year And Adding Mileage Completed In Given Year. Source: National Bureau Of Economic Research,Ministere Des Travaux Publics, Direction Des Chemins De Fer, "Statistique Des Chemins De Fer Francais" Under Heading: Situation For 1862-86; Documents Principaux For 1887-1905; Interet General For 1906-13 (Data Also Shown Under Latter Heading For 1921-35 And Possibly Later.) Data For 1862-77 Compiled By NBER By Adding Figures For Individual Railroads.
This NBER data series a02086c appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.
NBER Indicator: a02086c
Release: NBER Macrohistory Database
National Bureau of Economic Research, Railroad Mileage Initiated, All Railroads for France [A02F6CFRA364NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/A02F6CFRA364NNBR, February 14, 2016.