 Its construction was continued under the new FS management, which made it one of its twelve standard designs; it was the last and most successful 0-6-0 Italian locomotive.The class was built by several Italian and foreign manufacturers, between 1899 and 1913.The first 30 locomotives were fitted with a two-axle tender, with a coal capacity of and a water capacity of ; the subsequent ones were fitted with the three-axle tender that would see widespread service under the FS (especially behind the Class 625 and Class 640 locomotives).