Rail safety, by virtually every measure, has been steadily improving for decades—with derailments down 44% since 2000 according to Federal Railroad Administration data.
More on this storyHenry is world's smallest penguin's latest arrival
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Trump had hailed the December deal as a way to secure critical minerals from eastern DR Congo - the country has reserves of copper and cobalt, which are used to make batteries for products including mobile phones and electric vehicles.