Salta-Socompa

Stations,  crossing diversions and halts: 35.  Radiotelephonic stations: 3. Vaults and dry drainages: 22.

Sewers of rubblework: 8. Steel bridges (total of 670 mts): 31. Steel viaducts (total of 1270 mts): 13. Shelters: 6. Tunnels (total of 3233 mts):21. The tracks employed weigh 37 kg. by lineal metre.

1500 quebracho sleepers were used per kilometre. Between Salta and Socompa 855.000 sleepers were employed.

Zig-Zag

The first one is 4 km. from the Toro viaduct, in the Alisal station. The train backs uphill 890 mts., remaining partially in a blind tunnel of 88 mts., gaining a height of 54 mts.

The second one is 13 km. away from the first one; in Chorrillos station it gains 45 mts.

Gradient

This is the sloping a train climbs up or down. Example: the maximum gradient used in the Ramal C-14 is 25 per 1000; the train climbs up or down 25 mts. in one km. 25 per 1000 is the masimum gradient to avoid the use of  gear and rack traction.

Rollers

The rollers or spirals between Meseta and Diego de Almagro are the only ones in this country: these were employed in the last century in the construction  of the tracks over San Gothardo in the Suiss Alps.

The first one has a radio of 131 mts, and a gradient of 25 per 1000, with 1,5 km long.

The second one  has a similar radio but with a gradient of 21 per 1000, being 181,40 mts. long.

Tunnels

The highest tunnel of the railway is the number 19, 3900mts. high and 223 mts long. The longest is number 12, 504mts long in the form of an S.