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.