US train speeding when it derailed: investigators

A US passenger train was traveling at more than 100 miles per hour -- twice the speed limit -- when it derailed in Philadelphia, investigators said Wednesday, as the death toll from the crash rose to seven. The National Transportation Safety Board's first assessment of the data came as experts combed through the twisted train cars for more clues about how Tuesday night's wreck occurred. More than 200 people were injured in the crash, which took place along the busy northeast US rail co