; (2) the advisability of consist restrictions, including limitations on the arrangement and quantity of rail cars carrying liquefied natural gas in any given consist; (3) the identification of potential impact areas, and the number of homes and structures that would be endangered by a discharge in rural, suburban, and urban environments; (4) the impact of discharge on the environment, including examining environmentally sensitive areas with rail tracks that move through them; (5) the benefits of advanced notification to the Department of Transportation, State Emergency Response Commissions, and Tribal Emergency Response Commissions of routes for moving liquefied natural gas by rail tank car; (6) how first responders respond to a discharge, including the extent to which specialized equipment or training would be required and the cost to communities for acquiring any necessary equipment or training; (7) whether thermal radiation could occur from a discharge; (8) an evaluation of rail tank cars authorized by the Secretary of Transportation, a determination of which rail tank car would provide the best outcome in the event of a discharge, and a determination of whether a new standard is necessary to ensure the safety of rail transport of liquefied natural gas