Standard&Poor's Ratings Services has assigned its 'AA-' long-term rating to the Metropolitan Transportation Authority (MTA), N.Y.'s transportation revenue bonds (TRB) series 2015B. Bond proceeds will retire the authority's transportation revenue bond anticipation notes, series 2013A and 2013B. The outlook is stable. At the same time, Standard&Poor's affirmed its 'AA-' rating on the MTA's pro forma $50.0 million subseries 2012A-3 TRB, which are being remarketed April 2 (the mandatory tender date). The bonds will be Securities Industry and Financial Markets Association floating-rate tender notes (FRN) that will have a mandatory tender put in three-to-five years. In case of a failed remarketing of the 2012A-3 bonds, there are only soft puts, whereby the interest rates will increase to