49 C.F.R. § 242.503
(b) Each petition shall:
(3) Contain all available information that the person thinks supports the person's belief that the railroad acted improperly, including:
(c) A petition seeking review of a railroad's decision to deny certification or recertification or revoke certification in accordance with the procedures required by § 242.407 filed with FRA more than 120 days after the date the railroad's denial or revocation decision was served on the petitioner will be denied as untimely except that the Operating Crew Review Board for cause shown may extend the petition filing period at any time in its discretion: