SAN FRANCISCO (Standard&Poor's) July 14, 2015--Standard&Poor's Ratings Services assigned its 'AA-' long-term rating to the Metropolitan Transportation Authority (MTA), N.Y.'s $500 million series 2015C transportation revenue bonds (TRB), consisting of approximately $400 million subseries 2015C-1 (fixed rate), $50 million subseries 2015C-2 (mandatory tender bonds) and $50 million subseries 2015C-3 (LIBOR floating-rate tender notes). The outlook is stable. Standard&Poor's also affirmed the following ratings: 'AA-' issuer credit rating (ICR) on MTA 'AA-' long-term rating and underlying rating (SPUR) on the MTA's transportation revenue bonds (TRB) outstanding 'AAA/A-1' rating on MTA's series 2005D TRBs, reflecting the application of its joint criteria with low correlation. We base the ratings on the 'AA-' SPUR on the bonds and