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The Post’s Lena H. Sun followed up this morning on what caused last night’s disruption and emergency track work at Mt Vernon Sq 7th St-Convention Center: a train that carried no passengers derailed.

Metro’s press release on what happened explains that the train derailed in the pocket track of the Mt. Vernon Sq station at about 6:15 p.m. A pocket track is an area where trains can reverse to head in the opposite direction. All passengers had already been unloaded from the train before it derailed, so luckily no injuries were reported. But Sun’s story makes the important point that this was the second time such a derailment occurred at the same station since January 2007, and this rail car, a 5000 Series, was the same kind that was involved in the previous derailment. Metro told the Post that a section of track in the general area of last night’s derailment was set to be replaced in coming weeks.