Barack Obama

Emergency workers and Amtrak personnel inspect a derailed Amtrak train in Philadelphia, Pennsylvania

U.S. safety officials to testify to Congress on Amtrak crash

Reuters 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 18…

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