Tragedy in Triplicate

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No dog days for the National Transportation Safety Board. Investigators are digging on three fronts - Miami, Arizona and Guam - to pin down the causes of last week's train and plane crashes.

A software error appears to have taken out a radar system that could have warned the crew of a Korean Air jet that it was flying too low before it went down on Guam, killing 225 of 254 on board. In Miami, investigators determined that 45 tons of denim was improperly secured inside a cargo plane that crashed on take-off, killing at least five. And in Arizona, a collapsed bridge over a flooded desert gully was the culprit in an Amtrak train derailment that injured 116. (The bridge was undermined by rising waters before the train attempted to cross it.)