The rail and chemical industries have committed to a safer design for new tankers but are pressing regulators not to require modifications to tens of thousands of existing cars, despite a spike in the number of accidents as more tankers are put into service to accommodate soaring demand for ethanol, the highly flammable corn-based fuel usually transported by rail.Derailments have triggered chemical spills and massive blasts like one in July in Columbus, Ohio, that blew up with such intensity that one witness said it "looked like the sun exploded." Some communities with busy railways are beginning to regard the tankers as a serious threat to public safety.
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