Qualla: Tren a las Nubes

Tren a las Nubes: Introduction

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Fernando Martello, CC BY-SA 4.0. The name came from a movie. In the early 1960s, students filmed a journey along the Salta-Antofagasta railway, and their footage kept catching the same eerie sight: plumes of white vapor from the steam locomotive billowing up into the frigid mountain air, until the whole train seemed to be swimming through cloud. A documentary built from that film took the name Tren a las Nubes, the Train to the Clouds, and it stuck so well that the railway company eventually adopted it. The image is no exaggeration. This line climbs to 4,220 meters above sea level, high enough that the clouds are often below you, not above.

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Image: Fernando Martello | CC BY-SA 4.0

Tren a las Nubes: The Engineer Who Refused the Easy Way

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Aguila19, CC BY-SA 4.0. An American engineer named Richard Maury designed this railway, and he made one decision that shaped everything. He refused to use a rack-and-pinion system, the toothed track that lets trains haul themselves up steep mountain grades by brute mechanical grip. Without it, the line ...

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Image: Aguila19 | CC BY-SA 4.0

Tren a las Nubes: Crossing La Polvorilla

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Gavieiro Juan M, CC BY-SA 3.0. The journey's climax is a structure that seems to defy the thin air around it. The La Polvorilla viaduct, completed on November 7, 1932, curves 224 meters across a high desert ravine, its deck suspended some 64 meters above the canyon floor. As the train inches onto it, passenger...

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Image: Gavieiro Juan M | CC BY-SA 3.0

Tren a las Nubes: From Valley Floor to Roof of the World

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit Geogast, CC BY 4.0. The ascent is a study in transformation. Leaving Salta, the route enters the fertile Valle de Lerma, green and cultivated. Then it threads the Quebrada del Toro, a dramatic gorge where the walls close in and the vegetation thins. Finally the land opens into the puna, the bleak an...

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Image: Geogast | CC BY 4.0

Tren a las Nubes: A Railway That Endures

Sun, 21 Jun 2026 00:00:00 GMT

Photo credit GerthMichael, CC BY-SA 3.0. The Train to the Clouds has survived its own troubles. In July 2014, a train derailed near Abra Muñano before reaching San Antonio de los Cobres, and roughly 400 passengers had to be evacuated. The provincial government, citing safety failures, cancelled its contract with the pri...

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Image: GerthMichael | CC BY-SA 3.0