Article: Metro circuit had reported failures; NTSB combs 18 months of 'trouble tickets'.(D.C. AREA)

Byline: Jennifer Maas and Joseph Weber, THE WASHINGTON TIMES

The malfunctioning circuit that investigators are examining in connection with a deadly June 22 Metro train crash had been failing intermittently since December 2007, the National Transportation Safety Board said Thursday.

A component of the track circuit, which is part of a system that monitors the location of trains in the system, was replaced 19 months ago and had been experiencing problems periodically since, the NTSB said, citing Metro maintenance logs.

The investigation had already determined that a similar component, which didn't indicate the presence of a train, on the other ...

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