Map of The French railway network, as of 1856.
Own work ; created using Inkscape from Image:Carte_TGV.svg, released under GFDL by its authors Madcap, Steff, PemFR and Andrew pmk. Based on "Figure 11. Les différentes phases du développement ferroviaire français", in François Caron, Histoire des chemins de fer en France, Tome I : 1740-1883, Fayard, Paris, 1997.
Madcap, Steff, PemFR and Andrew pmk for original map ; Benjism89 for this one.