The Salta-Antofagasta railways passes through a plateau, what percentage of which is in Chile?
Salta–Antofagasta railway:  It is a railway with a total length of 941 km (571 in Argentina and 330 in Chile), connecting the city of Salta (Argentina) to the one of Antofagasta (Chile), on the Pacific Ocean, passing through the Puna de Atacama and Atacama Desert. Puna de Atacama: The Puna de Atacama or Atacama Plateau is an arid high plateau, in the Andes of northern Chile (15%) and Argentina (85%).
15%