At the start of the 20th century, the Jura mountain was equipped with 400 kilometres of metric railway lines completing the main general interest lines such as the Andelot-La-Cluse line. Winding between the rivers, chasms, precipices and ridges, the tram lines marked the Jura’s history and its landscape with their often-spectacular developments and infrastructures such as the Douanets viaduct in Foncine-le-Bas.