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As repair crews work to restore rail service following the deadly Amtrak derailment in Philadelphia, investigators are trying to determine the reason for the train's acceleration and sorting through conflicting reports about an object striking its windshield.

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National Transportation Safety Board officials investigating a deadly commuter train crash hope to have answers soon to how fast the train was going, whether its brakes were applied and whether its horn was sounded as it approached a crossing where it slammed into an SUV.