Open invitation to tender, deadline 31.07.2012, for the refurbishment of some sections of the vault of 8.6 km-long Ricken tunnel. Contract duration 03.03.2013 to 06.09.2013. For more, contact SBB Infrastruktur, attn Andreas Sarno, Zurich, e-mail andreas.sarno@sbb.ch and http://www.simap.ch/shabforms/servlet/Search?NOTICE_NR=738539. Tenders have to be sent to SBB Infrastruktur, East region, attn Hanspeter Sommer, Zurich. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=189298-2012. 25/12.