The Train to Clouds , thus denominated till the viaduct La Polvorilla, at the moment is dedicated in exclusive form to the tourism, that circulates from April to October and makes this imposing trip between four to seven times at the month.
It is one of the three higher railroads of the world, that crosses vertiginous mountains of the Mountain range Los Andes between spectacular landscapes. Part of the city of Salta, crosses the valley of Lerma, to introduce themselves into La Quebrada del Toro and to arrive until the Puna.
Denominated Train to Clouds, because of its high altitude, often clouds underneath the bridges or in slopes can be apreciated.
The amount of rollers, viaducts, tunnels and other sinuosities that the train crosses ought to that the author of the project, the American engineer Richard Maury, took party considering the principle from adhesion of the wheels of the train to the routes and by the laws from the physics, rejecting the mechanical system of railway rack commonly used so that the formation can climb without any kind of problems the heights. It does not use gears, not even for the raised parts of the high, because the routes are put in a peculiar way circulating around a system of zigzags and spirals.
The machine used in the C-14 branch has diesel-electrical propulsion with a motor of 2.475HP of power, 6 motor axes with 103 tonelades of gross weight. This locomotive consumes around six liters of fuel by kilometer.
Full stop of the route La Polvorilla is the Viaduct where the train arrives at the height of approximately 4,220 meters over the level of the sea.

JOURNEY
It has a route of 217 kilometers, with a duration of almost fifteen hours roundtrip. It crosses 29 bridges, 21 tunnels, 13 viaducts, 2 "rollers" and 2 zigzags. Part of the city of Salta, the lowest point, and from it initiates the way of climbing to full stop of the route there, the viaduct La Polvorilla, the most elevated of all the line of the train. In the different stations the inhabitants from the towns have colorful positions with crafts, regional clothes and products to acquire as a remember of the interesting trip. The train counts with services such as restaurant car, panoramic car, folkloric spectacles, medical, audio doctor's office, bilingual video and guides.

_Salta (1.187 meters over the sea level)_
_Alvarado_
_Campo Quijano_ Well-known locality also like the Vestibule of Andes and that gives the name to the fourth station. It is tradition that the villagers greets to the train when it makes sound his horn. _El Alisal (1.800 meters over the sea level)_ Its name ought to the presence of the colorful trees that you can see as landscape. The train makes the first zigzag, winning height by means of a backward movement.
_Chorrillos_ The train makes the second zigzag to obtain altitude in its ascending way.
_Puerta de Tastil_ It takes his name from the Ruins of Santa Rosa de Tastil, one of the most important of the province that are at a few kilometers.
_Muñano_
_San Antonio de los Cobres (3.775 meters over the sea level)_ Ancient population located next to the river of the same name. You can also arrive to it from the city of Salta by the National route N° 51. The town takes this name to be in the environs of the famous Sierra Cobre, rich in this mineral, this place offers all its splendor of legend and mineral wealth. Very good woven typical wool articles of alpaca, llama and vicuña can be acquired in this city.
_Mina Concordia_ The locomotive is come off the cars to be located at the end, pushing the cars until the viaduct and to be ahead to be able to return towards Salta.
_Viaducto La Polvorilla (4.200 meters over the sea level)_ (photo) Wonderful engineer installation that describes an arc on which the routes of the railroad are based, 224 meters of large by 63 of height. The train arrives with the machine back to carry out the return. It is recommended to walk slowly when the train stops allowing that the passengers descend due to the height and lack from oxygen.

* Track a las Nubes - Track to Clouds
Nowadays an economic option appeared making the trip by means of the Train to Clouds and returning by a special vehicle 4x4 denominated Movi Track by route; or directly carrying out all the passage of roundtrip by route on board of the mentioned Movi Track in the denominated itinerary Track to Clouds.