The story

Transportation investigators Wednesday discovered "anomalies" in an essential control circuit of a track where a fatal crash between two Washington subway trains killed nine people.

Each section of the transit system's track contains a circuit that transmits and receives signals that generate speed commands for trains, said Debbie Hersman of the National Transportation Safety Board. She said the circuits are "vital providing information to the operators and the train itself when on automatic."

Investigators found no problems in five of the six circuits on the stretch of track in the crash area. But they found "anomalies" with the sixth circuit, Hersman said. Read full article »

All About Washington, DCU.S. National Transportation Safety BoardSteny Hoyer

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