The day following the crash, investigators retrieved one of the two train event recorders ( black boxes ) from the wreckage, but it was unusable.
32.
Investigators also interviewed people who had been working in the yard, and reviewed the train's event recorder, which is similar to an airplane's flight data recorder.
33.
Investigators also interviewed people who had been working in the yard near Toledo, and reviewed the train's event recorder, which is similar to an airplane's flight data recorder.
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The event recorder downloaded from unit SP 7549 ( the third locomotive ), showed that it was producing traction current in motoring but no current in dynamic braking.
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NTSB investigators retrieved the event recorders that provide mechanical data on the trains, such as speed, braking maneuvers and use of horns at the time of the crash.
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Nonetheless, by admitting that earlier printouts were flawed, a CSX expert on event recorders had to acknowledge that thousands of black-box downloads in previous years were now unreliable.
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The event recorder took down the approach of the train and the activation of the warning system but was not designed to detect any impact with the gates.
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Carol Carmody, vice chairwoman of the National Transportation Safety Board, said Monday evening at the scene of the accident that two event recorders had been recovered from the train.
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The train's event recorder was recovered at around 15 : 00 the next day and the fire was finally extinguished in the evening, after burning for nearly two days.
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NTSB investigators have retrieved the event recorders that provide mechanical data on the trains, such as its speed, braking maneuvers and use of horn at the time of the crash.
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