Inside The Yellow Train or Train Jaune, Pyrénées-Orientales, Languedoc-Roussillon, France. The Ligne de Cerdagne, usually referred to as Le Petit Train Jaune or Yellow Train, or Tren Groc is a 1,000 mm gauge railway that runs from Villefranche-de-Conflent to Latour-de-Carol-Enveitg in the French Pyrenees. Construction started in 1903 and the section to Mont-Louis was completed in 1910, followed by an extension to Latour-de-Carol in 1927. It is 63 kilometres (39 mi) long and climbs to 1,593 metres (5,226 ft) at Bolquère-Eyne, the highest railway station in France. The line serves 22 stations, fourteen of which are request stops. (Sergi Reboredo / VWPics via AP Images)