Trans-Andean railways

Torrential rains from the 1982–83 and 1997-98 El Niño caused massive landslides that damaged the railway line.

[4] Empresa Nacional de Ferrocarriles - ENFE, operator of the National Railways of Bolivia, and consultant Hagler Bailly, United States, have signed a contract to undertake an economic feasibility study into the proposed $US 1 billion 338 km Aiquile–Santa Cruz Railway (IRJ July p6).

[6][7] The Huaytiquina railway is a single 1,000 mm (3 ft 3+3⁄8 in) gauge linking Salta, Argentina, to Antofagasta, Chile.

The Tren a las Nubes is a touristic service running for 217 kilometres (135 mi) on the Argentinian side.

In 2009, a deal was signed to build a 1,676 mm (5 ft 6 in), single gauge, base tunnel connecting Chile and Argentina[citation needed].