In South Carolina, some 75 residents are still being blocked from returning home two weeks after a Jan. 6 train crash released a deadly plume of chlorine gas. The chlorine leak killed eight people including six people working at a nearby textile mill. The train engineer also died from injuries in the crash. Another 250 people were left sick. Some 5,400 people were forced to be evacuated from their homes. The fatal accident has raised new questions about how safely hazardous chemicals can be transported by train.