A tractor-trailer careened into a busy local train station here during the evening rush hour on Friday, killing two people and injuring nearly two dozen others just south of downtown in Chinatown. Witnesses described hearing a deafening screech then the tremendous roar of the truck slamming into the street-level waiting area of the elevated train station, a bustling stop on the Red Line which runs a north-south route through the downtown Loop. The truck crashed through the glass front of the station, Cermak-Chinatown, and caused the escalators to collapse. Eleven people, four of them children, were in critical condition...