BRENTWOOD, Calif. - The coroner on Monday released the identities of the three women killed when an Amtrak train slammed into their car in Brentwood. Authorities said Mercedes Regalado, 50, of Antioch; Maria Nieves, 27, and Julia Mondragon, 40, both of Dixon, died Sunday after the commuter train smashed into their Honda Civic that was crossing the railroad tracks.