(a) This part applies, according to its terms, to each railroad that uses or operates—

(1) A railroad freight car subject to part 215 of this chapter;

(2) A locomotive subject to 49 U.S.C. chapter 207 (49 U.S.C. 20701-03); or

(3) Railroad passenger equipment subject to part 238 of this chapter.

(b) This part applies, according to its terms, to each railroad owning track subject to part 213 of this chapter.