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Safety Rule for Oil Trains Said to Be Released by U.S. on Friday

A federal safety rule to make railroad tank cars that haul oil and other flammable liquids less prone to rupture will be released Friday, according to two people familiar with the issue.

The highly anticipated rule probably will require that tank cars have thicker walls and stronger valves, along with other safety features. The Obama administration is issuing the regulation after a series of fiery accidents, including a July 2013 wreck in Lac-Megantic, Quebec, that killed 47 people.