philadephia amtrak crash

Bob Gildersleeve, a Towson businessman who lived in Elkridge, was killed in the Amtrak train derailment in Philadelphia, his company confirmed.

The derailment in Philadelphia of an Amtrak passenger train headed north from Washington and through multiple stops in Maryland left more than 200 people injured and killed seven — including a midshipman from the U.S. Naval Academy in Annapolis.

While many questions remained unanswered in the derailment of a northbound Amtrak commuter train in Philadelphia Tuesday night, here's what we know.