Viaducto la Polvorilla - 4200 m

The Salta–Antofagasta railway, also named Huaytiquina, is a single track railway line that links Argentina and Chile passing through the Andes. It is a 1,000 mm (3 ft 3+3⁄8 in) gauge railway with a total length of 941 km (571 in Argentina and 330 in Chile), connecting the cities of Salta and Antofagasta on the Pacific Ocean, passing through the Puna de Atacama and Atacama Desert. The construction of the railway started in 1921, the viaduct La Polvorilla, the highest of the line, was finished on 7 November 1932. It is now the final destination of the "tren de las nubes".

The viaduct was the highest and most northern point of our trip. From here we returned back south, heading all the way down to Ushuaia. See PiP's - scanned slide, Minolta X700