CLIENT: EUSKAL TRENBIDE SAREA (ETS)
Guipúzcoa, Basque Country (Spain)
Section 3,8 km long belonging to the new Basque Country railway system in Guipúzcoa, the so-called “Basque Y,” designed for mixed traffic with a speed of 250 km/h for passenger transport and 135 km/h for goods. It includes the provision of an intermediate passing loop.
The alignment runs in a succession of tunnels and viaducts opposite the town of Tolosa on the steep hillside of the left bank of the River Oria. The project required a lot of care and attentiondue to the environmental and landscape conditioners in the surroundings, required the building of:
Three twin track tunnels: Aldaba Txiki (687 m), Auzo Txikia (210 m) and Montezkue (1.544 m) and an escape gallery in the Montezkue tunnel (446 m).
Two cut and cover tunnels: Olarrain (179 m) and Arane (358 m).
Four integral and semi-integral composite viaducts: Salubita (141 m), Oaska (93 m), San Esteban (246 m) and Luzuriaga (90 m).