At least two people were killed and more than 70 injured early Sunday when an Amtrak passenger train collided with a CSX freight train in South Carolina, authorities said. The crash, which involved Amtrak Train 91 en route from New York to Miami, occurred at 2:35 a.m. in Cayce, S.C., outside Columbia, according to Derrec Becker of South Carolina Emergency Management. There were about 140 passengers on the train, Becker said.