The Petit train d'Artouste is a narrow gaugetourist railway situated in the French Pyrenees close to the Spanish border, some south of the town of Pau, and within the commune of Laruns. The line runs high above the headwaters of the Gave d'Ossau, and provides access to the Lac d'Artouste, a semi-artificial lake in the mountains at an altitude of over. The line was originally constructed for the Compagnie des Chemins de Fer du Midi, the then main line railway operator in the area to the north of the Pyrenees. As part of a program of electrifying these lines, the CFM constructed a series of hydro-electric power stations in the valley of the Ossau between the years 1920 and 1932. Significant civil engineering works were required in order to provide access to these works, and included the line now used by the petit train. Once this work was finished, the CFM recognised the tourist potential of the line, and the first tourist trains were run. Today the petit train is reached by a gondola from a lower station at Artouste-Fabrèges, on the Lac de Fabrèges in the valley of the Gave du Brousset. This lower station is at an altitude of and accessible by road. The gondola climbs to an upper station at an altitude of, where passengers change to the petit train. After leaving Ossau2000, the line runs through a tunnel, crossing under the ridge to reach a point high above the valley of the Gave de Soussouéou, another of the Gave d'Ossau's tributaries. From here the line runs along a twisting and vertiginous ledge above that valley until it reaches the dam of the Lac d'Artouste. The culminating point of the railway is approximately 1,940 m. The line is long and is built to a gauge of. Trains consist of 6 12-seat carriages pulled by a diesel locomotive, and operate from late May or early July until the end of September or early October. They are subject to a maximum speed of and the end to end journey takes just under one hour. On busy days, up to 10 trains are used providing 3 departures per hour, whilst at other times departures are hourly. Trains depart from 08.30 until 14:30 or later in the high season.
