For fast freight trains on the line through the Cevennes, the PLM opted for the 4-8-0 wheel arrangement, which still allowed a large boiler with a low axle load and good curve guidance. The only problem was the narrow firebox, which was offset by making it relatively long. They could tow 1,618 tonnes on the flat at 40 km/h and 501 tonnes on a one percent incline at the same speed. From 1919 more than 200 locomotives received a superheater and the four-cylinder compound engine was replaced with a simple one. They also pulled heavy passenger trains when needed and were in use until 1952.