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Tren a las Nubes

Tren a las Nubes
Railway information
NameTren a las Nubes
LocaleSalta Province, Argentina
Dates of operation1932 (completed  )
Track gauge1
Length434 km (269.7 mi)

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The Tren a las Nubes or Tren de las Nubes ( ) is a train service in Salta Province, Argentina, that connects the Argentine Northwest with the Chilean border in the Andes mountain range, over 4220 m (13845.1 ft) above mean sea level, the third highest railway in the world. Originally built for economic and social reasons, it is now primarily of interest to tourists as a heritage railway. The service runs along the C-14 line of the Ferrocarril General Manuel Belgrano.

The railway line has 29 bridges, 21 tunnels, 13 viaducts, 2 spirals and 2 zigzags. Because of the design decision not to use a rack-and-pinion for traction, the route had to be designed to avoid steep grades. The zigzags allow the train to climb up driving back and forth parallel to the slope of the mountain.

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