Seven dead in US train wreck, high speed at issue

The death toll from the derailment of a US passenger train in Philadelphia rose to seven Wednesday, as excessive speed emerged as a possible cause of the crash. As experts from the National Transportation Safety Board and other agencies combed through the twisted wreckage for clues, several reports suggested the train may have been traveling at twice the authorized speed when it derailed. More than 200 people were injured in the crash late Tuesday along the busy northeast US rail corridor linkin