LONDON (Dow Jones)--OeBB Infrastructur AG, Austria's government-guaranteed railway infrastructure agency, will price its EUR1.25 billion, 15-year bond issue at a spread of 55 basis points over midswaps, one of the banks leading the deal said Monday. Citigroup Inc., Erste Group, HSBC Holdings PLC and Morgan Stanley are leading the deal, which is likely to launch and price later Monday, subject to market conditions. The issuer is rated Aaa by Moody's Investors Service Inc. and AAA by Standard & Poor's Corp. -By Michael Wilson, Dow Jones Newswires; 44 20 7842 9349; [email protected] (END) Dow Jones Newswires June 21, 2010 08:54 ET (12:54 GMT)