((a)) ** .—** The Secretary of Transportation may take action the Secretary considers necessary to carry out this subchapter, including conducting investigations and public hearings, prescribing regulations and procedures, and issuing orders.

((b)) ** .—** In conducting an investigation or public hearing under this subchapter, the Secretary has the same authority the Secretary has under . An action of the Secretary in exercising that authority is governed by the procedures specified in section 46104 and shall be enforced as provided in section 46104.