29 C.F.R. § 1202.11
Under the terms of section 10 of the Railway Labor Act, if a dispute between a carrier and its employees is not adjusted through mediation or the other procedures prescribed by the act, and should, in the judgment of the National Mediation Board, threaten to interrupt interstate commerce to a degree such as to deprive any section of the country of essential transportation service, the Board shall notify the President, who may thereupon, in his discretion, create an emergency board to investigate and report to him respecting such dispute. An emergency board may be composed of such number of persons as the President designates, and persons so designated shall not be pecuniarily or otherwise interested in any organization of employees or any carrier. The compensation of emergency board members is fixed by the President. An emergency board is created separately in each instance, and is required to investigate the facts as to the dispute and report thereon to the President within 30 days from the date of its creation.
29 C.F.R. § 1202.11