Open invitation to tender, deadline 26/09/2024, for the refurbishment of the Guadarrama tunnel n.5 (km26+831 – km 29+377) on the Line 110 Segovia-Villalba de Guadarrama, section Cercedilla-Segovia (Madrid Segovia). Click here https://contrataciondelestado.es/wps/portal/perfilContratante for bid/tender documents and here https://elicitadores.adif.es/where tenders must be sent. Contract value EUR5.67 million, excluding VAT. Duration of contract 5 months. Contact Administrador de Infraestructuras Ferroviarias, Madrid, tel +34 676517106, email lblaya@adif.es. Visit https://ted.europa.eu/en/notice/-/detail/463668-2024. Ref.n. 3.24/27507.0079. 31/24.