The 7000-series railcars, built by Kawasaki Heavy Industries Rolling Stock Company of Kobe, Japan, were delivered for on-site testing during winter 2013–2014, and first entered service on April 14, 2015 on the Blue Line. The cars are different from previous models in that while still operating as married pairs, the cab in one car is eliminated, turning it into a B car. T design allows for increased passenger capacity, elimination of redundant equipment, greater energy efficiency, and lower maintenance costs. The National Transportation Safety Board investigation of the fatal June 22, 2009 accident led it to conclude that the 1000-series cars are unsafe and unable to protect passengers in a crash. As a result, on July 26, 2010, Metro voted to purchase 300 7000-series cars, which replaced the remaining 1000-series cars. An additional 128 7000-series cars were also ordered to serve the Silver Line to Dulles Airport (64 for each phase). In April 2013, Metro placed another order for 100 7000-series cars, which replaced all of the 4000-series cars. On July 13, 2015, WMATA used their final option and purchased an additional 220 7000-series railcars for fleet expansion and to replace the 5000-series railcars, bringing the total order number to 748 railcars. On February 26, 2020, WMATA accepted delivery of the final 7000-series car.