 Dual voltage ROTEM-supplied stock with greater luggage space is used for services to Athens International Airport.Line 3 rail vehicles utilize 750 V DC third rail current collection between Agia Marina and Doukissis Plakentias, changing to 25 kV AC overhead catenary while operating on the Proastiakos suburban railway for access to/from the airport.On 1 March 2012 a contract was signed between Attiko Metro S.A. and a joint venture for the construction of the extension of Line 3 from Haidari to Piraeus, 7.6 km long with six stations.