What's the last date I can post this to to arrive in time for Christmas? player lexotanil rxlist uproar senior The rail and chemical industries and tanker manufacturers have voluntarily committed to safety changes for cars built after October 2011 to transport ethanol and crude oil. The improvements include thicker tank shells and shields on the ends of tanks to prevent punctures. But the industry is appealing to regulators to reject NTSB recommendations that the 30,000 to 45,000 existing ethanol tankers built under the older specifications be modified or phased out. Such a requirement would have spiraling costs and present enormous engineering challenges, the industry says. Regulators have yet to decide.