Section 565, Pub. L. 91–518, title IV, § 405 , Oct. 30, 1970 , 84 Stat. 1337 ; Pub. L. 92–316 , §§ 7, 8, June 22, 1972 , 86 Stat. 230 ; Pub. L. 96–73, title I, § 120(a) , Sept. 29, 1979 , 93 Stat. 547 ; Pub. L. 97–35, title XI , §§ 1177(b), 1184, 1188(d), Aug. 13, 1981 , 95 Stat. 692 , 697, 699; Pub. L. 99–272, title IV, § 4016 , Apr. 7, 1986 , 100 Stat. 110 , related to protective arrangements for railroad employees. See sections 24307, 24312, and 24706 of Title 49, Transportation. Section 566, Pub. L. 91–518, title IV, § 406 , as added Pub. L. 96–73, title I, § 121 , Sept. 29, 1979 , 93 Stat. 548 , related to retention and maintenance of facilities. See section 24309 of Title 49 .