; or (B) there would be no harm beyond the property of the railroad carrier transporting the shipment or storage facility storing the shipment in the event of a successful terrorist attack on the shipment. (f) Alternative route and storage pattern selection for security sensitive material Not later than 90 days after submission of a report under subsection (e), the railroad carrier shall begin using the route and storage pattern that, as determined by the analyses required under subsections (d) and (e), best reduces the risk, including consequences, of a terrorist attack on, or derailment of, a shipment of security sensitive material that is transported through or near an area of concern. (g) Review Not less than once every 5 years, each railroad carrier that transports security sensitive material shall conduct a comprehensive, system-wide review of all operational changes, infrastructure modifications, traffic adjustments, changes in the nature of the areas of concern located along or in proximity to the route, or other changes affecting the security of the movements of the materials determined to be security sensitive under subsection (b) that were implemented during the 5-year period. (h) Definitions In this section, the following definitions apply: (1) Area of concern The term area of concern means a geographic region designated by the Secretary of Transportation as commanding special consideration with respect to the security of the transportation of security sensitive material, which shall include high threat urban areas as determined by the Secretary. (2) Railroad carrier The term railroad carrier has the meaning given that term in section 20102 of title 49, United States Code. (3) Security sensitive material The term security sensitive material means a material determined by the Secretary of Transportation to be security sensitive pursuant to subsection (b). (4) Storage pattern The term storage pattern means the conditions of storage, including— (A) location of cars in railroad yards or on