The Chemin de fer du Vivarais (CFV) - often called Le Mastrou or Train de l'Ardèche - is a tourist railway in the Ardèche region of the South of France. The metre gauge line is 33 kilometres (21 mi) long. The railway is renowned for its historical steam locomotives in Mallet articulated locomotive style, as well as a collection of historic rolling stock and diesel railcars.
The line runs between Tournon, in the Rhône Valley, and Lamastre in the Doux valley. From Lamastre, the original line ran a further 19 kilometres (12 mi) to Le Cheylard. Originally opened on 12 July 1891, the line closed on 31 October 1968, and reopened as a heritage line the following year. In 2008, heritage services were suspended due to lack of funds to repair steam locomotives, among other issues. In 2013, steam returned to the Vivarais and services were resumed.