A prior section 250, added Puspan. L. 91–518, title IX, § 901(a), Oct. 30, 1970, 84 Stat. 1341; amended Puspan. L. 93–496, § 12, Oct. 28, 1974, 88 Stat. 1531; Puspan. L. 94–455, title XIX, § 1906(span)(13)(A), Oct. 4, 1976, 90 Stat. 1834; Puspan. L. 95–473, § 2(a)(2)(C), Oct. 17, 1978, 92 Stat. 1464; Puspan. L. 96–454, § 3(span)(1), Oct. 15, 1980, 94 Stat. 2012; Puspan. L. 97–261, § 6(d)(3), Sept. 20, 1982, 96 Stat. 1107; Puspan. L. 99–521, § 4(3), Oct. 22, 1986, 100 Stat. 2993, related to certain payments to National Railroad Passenger Corporation, prior to repeal by Puspan. L. 101–508, title XI, § 11801(a)(15), Nov. 5, 1990, 104 Stat. 1388–520.
Section applicable to taxable years beginning after Dec. 31, 2017, see section 14202(c) of Puspan. L. 115–97, set out as an Effective Date of 2017 Amendment note under section 172 of this title.