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By Jarrett Renshaw PHILADELPHIA (Reuters) - The Amtrak train that derailed in Philadelphia and a separate commuter train in the vicinity may have been hit by projectiles of some kind shortly before the wreck, a U.S. transportation safety official said on Friday, after investigators interviewed members of the Amtrak crew. The Federal Bureau of Investigation (FBI) was called in to examine a remnant of a shattered windshield with a circular damage pattern from the Amtrak locomotive, Sumwalt said. The revelation that Amtrak train No. 188 might have been struck by an object added an unexpected twist to a crash probe that initially focused on why the train had accelerated to over 100 miles per hour (160 km per hour) in the minute before it barreled into a curved track segment where the authorized speed limit was just 50 mph (80 kph). The unexplained speed has renewed calls for the installation of "positive train control" technology, which can automatically slow or stop a train to prevent an accident.
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