The Petit train d'Artouste is a narrow gauge tourist railway situated in the French Pyrenees close to the Spanish border, some 55 km (34.2 mi) 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 nearly 2,000 m (6,562 ft).

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.

[1][2] 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.

The gondola climbs to an upper station (known as Ossau2000) at an altitude of 1,920 m (6,299 ft), where passengers change to the petit train.