A prior section 11123, Pub. L. 95–473, Oct. 17, 1978, 92 Stat. 1422; Pub. L. 96–448, title II, § 226, Oct. 14, 1980, 94 Stat. 1930, related to situations requiring immediate action, prior to the general amendment of this subtitle by Pub. L. 104–88, § 102(a).

2004—Subsec. (a). Pub. L. 108–199, § 150(1)(A)(i), inserted “failure of existing commuter rail passenger transportation operations caused by a cessation of service by the National Railroad Passenger Corporation,” after “cessation of operations,” in introductory provisions.

Subsec. (a)(5). Pub. L. 108–199, § 150(1)(A)(ii)–(iv), added par. (5).

Subsec. (b)(3). Pub. L. 108–199, § 150(1)(B), designated existing provisions as subpar. (A), substituted “Except as provided in subparagraph (B), when” for “When”, and added subpar. (B).

Subsec. (c)(4). Pub. L. 108–199, § 150(1)(C), added par. (4).

Subsecs. (e), (f). Pub. L. 108–199, § 150(1)(D), added subsecs. (e) and (f).