Tren a las Nubes by Luchonda
Train to heaven, or the roof of America. It will lead you from Salta to La Polvorilla (270km)From a height of 1200m up to 4200 meters.
BTW i did by bus, a breathtaking trip
The train trip is noticed as unique and breathtaking strolling over extraordinary metall bridges and overwhelming landscapes.
But you need time because the trip takes about 15 hours between departure and arrival
Unfortunally i never made it to do this tour becausereservation is needed two weeks before departure and doesn't match with the formula of Best Tours, my Belgian Agent