The decision made Thursday morning by the Washington Metropolitan Area Transit Authority came four days after the worst crash in the subway system's 33-year history.
Metro board members say they understand that there is a perception about these rails cars.
Most of the 1000 Series rail cars are on the Red Line. The striking train in this week's collision was made up of six Series 1000 cars.
In 2006, the National Transportation Safety Board has recommended Metro upgrade or phase the Series 1000 cars.
The decision comes on the heels of another major decision -- the review of all the circuits throughout the rail system. There are between 2,500 and 3,000 sensors along the tracks.
The union representing Metro operators has said the cars should be in the middle.
The decision could mean slower trains because of the time it will take to reconfigure the trains.
Also, there is no timetable yet for when the full Red Line will be back up and running.
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