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The Chemin de fer de Petite Ceinture (French for “little belt railway”) was a Parisian railway that, from 1852, was a circular connection between Paris’ main railway stations within the fortified walls of the city. Paris’ Chemin de Fer de Petite Ceinture idea was military in origin. Rail transport was still relatively new when Paris’ 1841 city fortifications were completed, and France’s Generals saw rail as a way of quickly moving troops and material between points along the circular wall. The government of the time was too financially burdened to undertake building the railway on its own, so turned to France’s major rail companies for participation and financial support: the birth of Paris’ circular railway was a compromise between these goals. Access to the unused rail tracks is forbidden, but enthusiasts explore it nonetheless, describing it as a quiet, natural garden space within Paris. An 800 metre-long, unlit tunnel on the abandoned line contains, in one of its walls, an entrance to the Catacombs of Paris where access is likewise forbidden, but which enthusiasts also explore nevertheless.
here are more [pics](http://imgur.com/a/X2SBE).