BAGONG ALYANSANG MAKABAYAN (BAYAN), REPRESENTED BY ITS SECRETARY-GENERAL, RENATO M. REYES, JR.; REPRESENTATIVE NERI JAVIER COLMENARES; TRAIN RIDERS NETWORK (TREN), REPRESENTED BY ITS SPOKESPERSON, JAMES BERNARD ECHANO RELATIVO, AND MEMBERS, ANGELO VILLANUEVA SUAREZ AND MARIA DONNA GREY MIRANDA; MARIA FINESA ALCANTARA COSICO; SAMMY T. MALUNES; FERDINAND RIMANDO GAITE; AND MARIA KRISTINA CASSION, PETITIONERS, VS. HON. JOSEPH EMILIO A. ABAYA, IN HIS CAPACITY AS SECRETARY OF THE DEPARTMENT OF TRANSPORTATION AND COMMUNICATIONS AND AS CHAIRMAN OF THE LIGHT RAIL TRANSIT AUTHORITY BOARD OF DIRECTORS; DEPARTMENT OF TRANSPORTATION AND COMMUNICATIONS; HON. HONORITO D. CHANECO, IN HIS CAPACITY AS ADMINISTRATOR OF THE LIGHT RAIL TRANSIT AUTHORITY; LIGHT RAIL TRANSIT AUTHORITY; AND LIGHT RAIL MANILA CORPORATION, RESPONDENTS