Paris' former Chemin de fer de Petite Ceinture ('small(er) belt railway'), also colloquially known as La Petite Ceinture, was a circular railway built as a means to supply the city's fortification walls, and as a connection between Paris' railway termini. Built as two distinct 'Ceinture Syndicate' freight and 'ParisAuteuil' passenger lines from 1851 that together formed an arc that surrounded ...