 Their light weight per axle made them capable of hauling both passenger and goods trains on most of the État's network.The engines' performances were honorable, and could haul 1000 ton trains at on the level, 550 ton trains at the same speed on gradients of 10‰ (1 in 100) and 260 ton trains on gradients of 20‰ (1 in 50).The 340 locomotives were ordered in three series.