Prior information notice for the design to reinforce and improve tunnels for the conventional and metric gauge network of Adif. Click here for tender documents where tenders/requests to participate must be sent. Value of the contract is EUR 440,000, excluding VAT. The duration of the contract is 24 months. Estimated date of publication of contract notice: 30/06/2021. Contact Adif, Madrid, tel +34 917744804, fax +34 917674490, email contrataciondcc@adif.es. For further on the TED tender, please click here. 21/21.