Federal safety investigators said Tuesday they fear flaws found in Washington's Metro subway system after a deadly crash this summer may endanger other transit systems, and they sent out an urgent recommendation asking that other rail operators check for similar problems.
The cause of a deadly Washington Metro subway crash last month remains a mystery, with one problem identified by investigators persisting even after engineers replaced a key part that was believed to be faulty, a top Metro official said Tuesday
Officials investigating last week's crash of two Metro subway trains said a system used to detect trains in the area of the accident had failed intermittently in the days immediately before the fatal crash.
The NTSB had previously issued a warning about the kind of train that crashed in Washington this week.
After touring the wreckage Tuesday of two Metro transit trains that crashed the day before, killing nine, Washington Mayor Adrian Fenty said it was a sight that "no one should have to see."
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