Philadelphia: As Amtrak begins fully restoring America's busiest passenger rail corridor for the first time in almost a week following a deadly crash in Philadelphia, officials are vowing to have safer trains and tracks while investigators are trying to determine the cause of the derailment.

Amtrak officials said yesterday that trains along the busy Northeast Corridor from Washington to Boston would resume service today in "complete compliance" with federal safety orders following last week's deadly derailment.