Open invitation to tender, deadline 02/12/2022, for the maintenance of stations, tunnels and rolling stock for the Thessaloniki metro, including the extension to Kalamaria. Value of the contract is EUR292 million, excluding VAT. Duration of the contract will be 132 months. Contact Attiko Metro AE, attn Aikaterini Saiti, Athens, tel +30 2106792473, fax +30 2106726126, email ksaiti@ametro.gr. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=483140-2022. Ref. RFP-427/22. 36/22.