Aldesa has built more than 20 new stretches of high speed rail lines for the network which is being built throughout Spain, building confidence with local administrations that it has the capacity to undertake such specialist railway work. In order to carry out this work, the company employs highly qualified professional staff and provides the technology required, such as the 142 metre long tunnel borer weighing 1,450 tonnes which dug the San Pedro Este tunnel for the Madrid-Valladolid high speed rail line.