Wrong Answer
National Transportation Safety Board, March 23, 2006 (official report here): "Because the 1000-series, Rohr-built, passenger railcars, which will comprise 26 percent of the Metrorail passenger railcar fleet when all the cars are delivered, are vulnerable to catastrophic telescoping damage and complete loss of occupant survival space in a longitudinal end-structure collision (as occurred at the Woodley Park station), the Safety Board believes that WMATA should either accelerate retirement of Rohr-built railcars, or if those railcars are not retired but instead rehabilitated, then the Rohr-built passenger railcars should incorporate a retrofit of crashworthiness collision protection this is comparable to the 6000-series railcars."
Metro General Manager John Catoe, June 22, 2009, after confirming that the lead car on the moving train was a 1000-series Rohr-built car (reported here): "I have no basis to suspend the use of 1000-series cars at this time."