Amtrak says an Acela high-speed train has killed three people on the railroad tracks in suburban Philadelphia.
Amtrak spokeswoman Karen Dunn says none of the approximately 300 people on the southbound train was injured, but they remained on the scene hours later waiting for another train to pick them up.
The train was on its way to Washington.
Service on other Amtrak trains in the corridor was restored within 30 minutes.
Acela trains can go up to 150 miles an hour, but Dunn says she doesn´t know what the speed limit is at the scene of the accident.
She says engineers need at least a mile to stop a fast-moving train if they see someone on the tracks.