At the discretion of the hearing officer and upon reasonable notice to the parties, oral argument may be made at the close of testimony before him as an alternative to the filing of written briefs. Such argument, which should include requested findings and conclusions, will be recorded and made a part of the transcript of testimony, and will be available to the Board for consideration in deciding the case. The making of such argument will not preclude oral argument before the Board.
49 C.F.R. §1113.16