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The windshield of the train may have been hit by something before the crash.  The area of interest is the circular mark on the right side of the windshield.
The windshield of the train may have been hit by something before the crash.  The area of interest is the circular mark on the right side of the windshield.

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    FBI examining what struck Amtrak train's windshield

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FBI examining what struck Amtrak train's windshield

The investigation continues, as Amtrak restored Northeast service Monday. CNN's Rene Marsh reports.

FBI examining what struck Amtrak train's windshield

The investigation continues, as Amtrak restored Northeast service Monday. CNN's Rene Marsh reports.