Have there been other incidents in which the Automatic Train Control System failed to maintain a large distance between trains?
In 2005, there was an event in which three trains came very close to each other. The cause of that incident was determined to be cabling in the track circuit, below the track bed. In the current investigation of the June 22, 2009 accident, the NTSB is focused on track circuit modules in a train control room in its investigation of the cause of the collision. The train control room is some distance from the actual tracks. On June 7, 2005 just after 6 p.m., a track circuit problem was identified in the tunnel between Foggy Bottom and Rosslyn Metrorail stations on the Orange/Blue Line. A train had stopped and second train came within 30 feet of the first, and a third train came to within 30 feet of the second. A news release was issued. As a precaution, trains were placed in manual mode between the two stations. About a week later, in a news release, officials identified the source of the track circuit problem as a defective 3,000-foot communications cable (part of the track circuit syste
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