– Contracting authority: Administrador de Infraestructuras Ferroviarias (Adif).

The Grimaldo-Casas de Millán AVE construction project consists of the construction of a high-speed platform with an electrified European gauge double track with a total length of 6,600 metres and two viaducts: a 75-metre-long Boquerón stream and a 90-metre-long Campillo stream.

ithin the Grimaldo-Casas de Millán AVE project, the construction of the Santa Marina tunnel stands out, with 3,595 metres, of which 275 metres are in an artificial tunnel and 3,320 metres in a mine. The total excavation amounts to 1,192,105 m³, and the concrete slab 7,169 m^3.