121 tonnes of rail, 550 tonnes of sleepers and 145 lorries loaded with ballast are just one example of what goes into building just one kilometre of single track on a high-speed line. Technicians from Ineco have been working with Adif and Adif Alta Velocidad for more than 15 years to guarantee the quality and supply of all railway materials used for track assembly. A job that requires maximum rigour and, over time, has resulted in the creation of a proven methodology.