49 C.F.R. § 273.5
(3) Application.
(c) Certified schedule—(1) Metric. The certified schedule metric is the number of certified schedules, uncertified schedules, and disputed schedules, reported by train, by route, and by host railroad (excluding switching and terminal railroads), identified in a notice to the Federal Railroad Administrator by Amtrak:
(2) Reporting. If a train schedule is reported as a an uncertified schedule under paragraph (c)(1)(vi), (vii), or (viii) of this section, then Amtrak and the host railroad must transmit a joint letter and status report on the first of each month following the report, signed by their respective chief executive officers to each U.S. Senator and U.S. Representative whose district is served by the train, the Chairman and Ranking Member of the Committee on Transportation and Infrastructure of the House of Representatives, the Chairman and Ranking Member of the Committee on Commerce, Science, and Transportation of the Senate, the Chairman and Ranking Member of the Committee on Appropriations of the House of Representatives, the Chairman and Ranking Member of the Committee on Appropriations of the Senate, the Secretary of Transportation, and the Chairman of the Surface Transportation Board, which states: