- The Washington Times - Thursday, June 25, 2009

An automated circuit located nearby the scene of Mondays fatal Metro crash showed anomalies after being tested by investigators, and is being looked at for further testing, officials said Wednesday.

The 740 ft. circuit is designed to relay signals to incoming Metro trains, including commands to stop in case another train is stationary further ahead on the track. It was one of six similar devices located on the track between Fort Totten and Takoma Park Metro stations that were tested by investigators.

Debbie Hersman, a National Transportation Safety Board member, said that five of the six circuits that were tested operated per standard by recognizing a device that simulates train wheels on the track. One circuit, however, did not recognize the device, called a shunt.

“That’s a circuit that our investigators are paying close attention to now,” she said.

The test was one of several that were conducted by investigators on Wednesday to determine what caused the crash, which killed nine people and injured scores more.



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