Ferronor

[2] The Diego de Almagro division connects Potrerillos (a now abandoned town and mine in the Andes at 2,800 metres (9,200 ft), only the smelter is still in use) with Llanta (filtration plant and workshops) and Diego de Almagro, where the line connects to the Longitudinal Norte, and continues to Chañaral and the harbor at Barquito.

The line was built starting 1916 by the Andes Copper Mining Company to connect the Potrerillos copper mine and smelter with Pueblo Hundido[3] (now called Diego de Almagro), where it connected to the state railway network, which continued to Chañaral.

The copper refining process requires large quantities of sulfuric acid, which is produced on-site at Potrerillos.

The Vallenar division connects the Los Colorados iron ore mine with the harbor at Huasco.

Ferronor also owns various steam locomotives and other historic rolling stock, which is on display in an open-air "museum" at Baquedano.