Automatic train control returned to the Red Line on Washington, D.C.'s Metrorail system today, following years of infrastructure upgrades that occurred in the wake of a deadly 2009 crash. For now, the change will be limited to eight-car rush-hour trains, which will once again start and stop via computer control. Human drivers will remain on board to open and close doors, and other parts of the system won't be automated for a while to come, but the news was a win for an agency that sorely needed one.
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