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In this photo released via Twitter by the National Transportation Safety Board, NTSB investigator Rick Downs takes measurements at scene of a commuter rail accident Tuesday, Aug. 22, 2017, in Upper Darby, Pa. An inbound train crashed into the rear of the parked train, pictured, at the suburban Philadelphia terminal early Tuesday morning, injuring dozens of passengers and the train's operator. (National Transportation Safety Board via AP)

In this photo released via Twitter by the National Transportation Safety Board, NTSB investigator Rick Downs takes measurements at scene of a commuter rail accident Tuesday, Aug. 22, 2017, in Upper Darby, Pa. An inbound train crashed into the rear of the parked train, pictured, at the suburban Philadelphia terminal early Tuesday morning, injuring dozens of passengers and the train's operator. (National Transportation Safety Board via AP)

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