The Osebe tunnel is located in the "Padron-Osebe" section of the railway corridor that runs along the Atlantic coast, known as the Atlantic High-Speed Axis. Its almost four kilometres of track form part of the 97.5

kilometres linking Santiago with Vigo. The tunnel is 865 metres long and designed for double track. Caldibe was commissioned to manufacture two gantries with a total weight of 7.5 tonnes.