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By Richard Cowan WASHINGTON (Reuters) - Human error remains a strong focus of the inquiry into the Philadelphia Amtrak crash, but federal investigators are still digging for answers, aides said ahead of the first hearing in the U.S. Congress on last month's deadly accident. House Republican aides told reporters on Monday that investigators might suspect human error caused Amtrak Train 188 to hit speeds of 106 miles per hour (171 km per hour) in a zone with a 50-mph (80-kph) speed limit. Christopher Hart, chairman of the National Transportation Safety Board, is scheduled to testify to the House of Representatives' Transportation and Infrastructure Committee.
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