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U.S. transportation officials on Thursday pressed for companies to come up with safer ways to transport oil on the nation’s rail lines following some explosive accidents as crude trains proliferate across North America.

After a closed-door meeting with oil and railroad executives in Washington, D.C., Transportation Secretary Anthony Foxx said the industry agreed to make voluntary changes aimed at accident prevention within the next 30 days.

Topping the list are plans to analyze the risks of oil trains that in recent years began passing regularly through major metropolitan areas across the U.S., Foxx said. The results could be used to alter some routes, government officials said. Railroads also will consider where oil trains could be slowed down, to lessen the potential danger in areas that pose the greatest threat to public safety.