The Ligne de Cerdagne (French pronunciation: [liɲ də sɛʁdaɲ]), usually referred to as Le Petit Train Jaune (English: Little Yellow Train, Catalan: Tren Groc), is a 1,000 mm (3 ft 3+3⁄8 in) gauge railway that runs from Villefranche-de-Conflent to Latour-de-Carol-Enveitg in the French Pyrenees.

This same law approved the granting of a concession for the line, signed on 5 December 1902, between the Minister of Public Works and the Compagnie des Chemins de Fer du Midi et du Canal Latéral à la Garonne.

The law also superseded an earlier proposed standard gauge railway which had been authorised between Villefranche-de-Conflent and Olette, but never built.

[4][5] The line 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 open carriages allow dramatic views as the train traverses the twisting route and are popular with tourists.