In 1942, Baldwin delivered two metre gauge 2-10-2 locomotives to the Ferrocarril Estado Villazón a Atocha which had been ordered by the Servicio Ferroviario de Yacimientos. Oil-fired and with 1,440 hp, they were relatively powerful for narrow gauge locomotives and had small drivers with a diameter of four feet or 1,220 mm. At 30 km/h, they were rated with 1,860 tonnes on the level, 605 tonnes on one percent or 210 tonnes on two percent. Top speed in service was 45 km/h.

Two more each were delivered in 1943 and 1946. They got the numbers 10 to 15 and later became ENFE numbers 704 to 709. In the meantime, the last two had also been used by the Arica-La Paz as their numbers 111 and 112. Today the remains of five of the six locomotives are still existing, but in a rather poor condition. 705 and 707 to 709 are located at Tupiza and 706 at El Tejar.