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The Chemin de Fer de Boulogne à Bonningues (CF de BB) was a gauge railway from Boulogne to Bonningues-lès-Ardres, Pas-de-Calais, France, where it had a connection with the Chemin de fer d'Anvin à Calais. It opened in 1900 and closed in 1948. History of rail transport in France In France, the building of railways was controlled by the Government. This avoided the duplication of routes that was seen in the United Kingdom and meant that the large cities and towns were connected. The citizens of the smaller towns and villages also wanted railways to be built to connect them to the network. The departments were given authority to oversee the construction of these minor lines, some of which were built to standard gauge and others were built to metre gauge or less. The Loi Migneret of 12 July 1865 established that railways in France were to be classified as of Intérêt Général or Intérêt Local. The former were deemed to be of sufficient importance that they could be partly charged to the state. The latter were charged to the department. In 1883, a proposal was put forward for a railway from Le Portel to Bonningues-lès-Ardres, in the Pas-de-Calais department. It was decided at an early stage that the line would have to go through Saint-Martin-Boulogne, a village from Boulogne which lies at an elevation of . This presented a problem as a direct line would be too steep for steam trains. Two options were considered, an route from the Gare de Boulogne-Ville northwards via Terlincthun and a route southwards via the Val Saint-Martin. Consideration was given to the line east of Licques running to Tournehem-sur-la-Hem instead of Bonningues-lès-Ardres. In 1890, permission was given to the Compagnie des Chemins de Fer Économiques du Nord (CEN) to build three metre gauge railways in Pas-de-Calais. Two were to run from Boulogne; one to Le Portel and the other to Bonningues-lès-Ardres. The third line was to run from Frévent to Lens. The two lines from Boulogne were run separately, with the Boulogne–Le Portel line operated as an electric tramway.