Tank cars, vital link in wartime domestic oil transport; with railroads breaking all-time traffic records, they are still able to give valuable service in hauling the tank cars of the oil companies from Gulf Coast and Texas fields. But only a fraction of the required tank cars are available. Railroads are hauling 500,000 barrels daily, hope for 800,000 as more cars can be made available for movement to the East. But this still would be only half of the normal civilian requirement