For the purposes of this chapter—

(1) "Secretary" means the Secretary of Transportation.

(2) "Board" means the Surface Transportation Board.

(3) "Railroad" means any rail carrier subject to part A of subtitle IV of title 49.

(4) "Certificate" means certificates issued by trustees of a railroad pursuant to subsection 77(c)(3) of the Bankruptcy Act, as amended.

(Pub. L. 91–663, §2, Jan. 8, 1971, 84 Stat. 1975; Pub. L. 104–88, title III, §325(1), Dec. 29, 1995, 109 Stat. 951.)