Train to the Clouds - Tren A Las Nubes is one of the highest trains in the world. The train is for tourists and leaves from Salta along the Valle de Lerma and gets into Quebrada del Toro and reaches the Puna. The train trip takes 15 hours, crossing 29 bridges, 21 tunnels and 13 viaducts making it a spectacular train journey 4200 m above sea level.
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