All materials filed with FRA or any FRA officer in connection with a proceeding under subpart B, C, or D of this part shall be submitted in duplicate to the Assistant Chief Counsel for Safety, (RCC-30), Office of Chief Counsel, Federal Railroad Administration, 1200 New Jersey Avenue, SE., Washington, DC 20590, except that documents produced in accordance with a subpoena shall be presented at the place and time specified by the subpoena.