The line is one of the highest railways in the world, reaching a summit of 4700m above sea level.

The concessionaire will be responsible for the design, financing, and rehabilitation of infrastructure and rolling stock, together with the provision of trains, equipment and electromechanical systems, operation, and maintenance of the railway.

The project will include work on retaining walls and drainage as well as rehabilitation of the line's 38 tunnels and 15 viaducts.