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.