Open invitation to tender, deadline 04.04.2013, for extension and equipment of south and north tubes of Koralm tunnel, lot KAT3 km 61 +000 - km 75 +135, on the Graz-Klagenfurt high speed line. The contract includes connection with the existing ventilation building at Paierdorf. Time limit for receipt of requests for documents or for accessing documents: 07.03.2013. Duration of contract 04.11.2013 to 31.5.2020. Contact OBB, att.n Mr Manfred Stadlober, Vienna, tel +43 316930006117, fax +43 31693000-6119, e-mail andreas.kiesling@oebb.at. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=371026 -2012. 48/12.