Signal Failure Cited in D.C. Train Crash

Investigators say equipment that is supposed to detect stopped trains in Washington, D.C., failed periodically in the days leading up to a deadly Metro transit train crash.

Nine people were killed and more than 70 injured June 22 when a train slammed into another train stopped on the tracks near the Maryland state line.

The National Transportation Safety Board said Wednesday that the signal system problems began occurring after a piece of equipment was replaced June 17, five days before the crash. The NTSB says the signaling system at the crash site also failed intermittently during tests after the crash.

Metro did not immediately respond to a request seeking comment.