 In June 2016, the 7000-series was taken out of service on Blue, Orange and Silver Lines after Metro discovered that trains could lose contact with the third rail on a steep curve, which caused a train to shut down outside .On December 31, 2016, a "Washington Post" article reported that some residents in DC's Petworth neighborhood were noticing increased noise and vibration levels attributed to the heavier, steel-bodied 7000-series trains.According to the article, Metro engineers conducted initial field tests and noted only "negligible vibration levels."