The chaos underground spread to the commuter rails Saturday, as a Metro-North rider was stabbed in the chest over an argument about noisy music while a train arrived in Grand Central. The attack happened at about 7 p.m. on a New Haven line Metro-North train arriving at the station, according to the MTAPD. Abdul Malik Little, 46, was playing music over his phone’s speaker and took exception when a 31-year-old fellow rider complained about the racket. Little stabbed the unidentified 31-year-old man in the chest twice with a knife as the train pulled into Grand Central, the MTAPD said. The...