 These cars used the original flip-dot exterior destination signs, chopper-controlled DC propulsion system, and the original cream, orange and yellow interior all the way up to their retirement.Car 4018 was damaged in the Woodley Park accident, but was eventually repaired.On July 4, 2010, Metro took all 100 4000-series cars out of service to repair the door motors to prevent them from unintentionally opening while the train is in motion, a situation that Metro engineers were able to duplicate in a rail yard.