; (2) to include, in the notification provided pursuant to paragraph (1), a written gas discharge plan with respect to the applicable hazardous materials being transported; and (3) to reduce or eliminate blocked crossings resulting from delays in train movements. (c) Additional requirements In developing the regulations required under subsection (a), the Secretary shall include requirements regarding— (1) train length and weight; (2) train consist; (3) minimum buffer zones between where crew are present on the train and cars with hazardous materials; (4) route analysis and selection; (5) speed restrictions; (6) track standards; (7) track, bridge, and rail car maintenance; (8) signaling and train control; (9) response plans; and (10) any other requirements that the Secretary determines are necessary. (d) Additional rulemaking Not later than 2 years after the date of the enactment of this Act, the Secretary shall issue regulations, or modify existing regulations, establishing safety requirements for rail carriers operating trains that pose a potential safety risk that include requirements regarding— (1) train length and weight; (2) train consist; (3) the ability for train crews to communicate with each other and other rail employees; (4) signaling and train control; (5) response plans; and (6) any other requirements that the Secretary determines necessary. (e) High-Hazard flammable trains Not later than 1 year after the date of the enactment of this Act, the Secretary shall modify the safety requirements for trains subject to section 174.310 of title 49, Code of Federal Regulations, to satisfy, in whole or in part, the rulemaking required under subsection (a). 5. Yardmasters hours of service (a) Limitations on duty hours of yardmaster employees Section 21103 of title 49, United States Code, is amended— (1) in the section heading by inserting and yardmaster employees after train employees ; (2) by inserting or yardmaster employee after train employee each place it appears