Argentina has a remarkable train known as “Tren a las Nubes,” the train to the clouds. It climbs from picturesque Salta to 4,200 meters, which is 13,800 feet. It was built to serve a mine that is closed, so it has no destination. But it ends at a spectacular curved trestle 70 meters (230 feet) high.
During the 16-hour trip, the train travels 217 km and climbs a staggering 3,000 meters. It crosses 29 bridges, 12 viaducts, 21 tunnels, swoops round two gigantic loops and two switchbacks. Train to The Clouds got its name from the numerous clouds that are often seen under bridges and around slopes.
The photo - Viaducto La Polvorilla: credit to Guillermo Tomoyose at flickr.com.