On February 6, 2017, Metro confirmed the accelerated retirement of the 4000-series cars due to their many reliability concerns. According to WMATA, "The 4000-series rail cars were by far Metro's least reliable, traveling an average of only 27,259 miles between delays. By contrast, the best performing cars, the 6000-series, are nearly four times more reliable, traveling more than 103,000 miles between delays." On June 7, 2017, Metro announced that the 4000-series cars would be fully retired and removed from service on July 1, 2017, and by that date, all cars were taken out of service. The last of the cars left for scrapping on February 13, 2018.