Section, Pub. L. 91–518, title VI, § 602 , Oct. 30, 1970 , 84 Stat. 1338 ; Pub. L. 92–316, § 10(a) , June 22, 1972 , 86 Stat. 231 ; Pub. L. 93–146, § 13 , Nov. 3, 1973 , 87 Stat. 553 ; Pub. L. 93–496, § 9 , Oct. 28, 1974 , 88 Stat. 1531 ; Pub. L. 94–25, § 11 , May 26, 1975 , 89 Stat. 92 ; Pub. L. 94–555, title I, § 102(c) , Oct. 19, 1976 , 90 Stat. 2614 ; Pub. L. 95–421, § 2(b)(2) , Oct. 5, 1978 , 92 Stat. 923 ; Pub. L. 96–73, title I, § 122(b)(2) , Sept. 29, 1979 , 93 Stat. 551 ; Pub. L. 97–35, title XI, § 1186 , Aug. 13, 1981 , 95 Stat. 698 ; Pub. L. 99–514, § 2 , Oct. 22, 1986 , 100 Stat. 2095 ; Pub. L. 100–342, § 18(e) , June 22, 1988 , 102 Stat. 637 , related to authority of Secretary of Transportation to guarantee any lender or lessor against loss of principal or interest on loans issued to improve rail passenger service.