The 2009 Washington Metro train collision was a subway train-on-train collision between two southbound Red Line Washington Metro trains during the afternoon rush hour of June 22, 2009, in Northeast Washington, D.C., United States. A moving train collided with a train stopped ahead of it; the train operator and eight passengers were killed, making it the deadliest crash in the history of the Washington Metro. Several survivors were trapped for hours, and approximately 80 were injured. Preliminary investigation has found that after the June 17 replacement of a track circuit component at what became the site of the June 22 collision, signals had not been reliably reporting when that stretch of track was occupied by a train.
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