Safety advocates have been pressuring Canadian and U.S. officials to create new safety standards for tank cars and to make old DOT-111s like this one more puncture-resistant. Nati Harnik/AP hide caption

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The view inside Wrigley Field during a 1959 Cubs game. The stadium was built in 1914 and celebrates its centennial this year. AP hide caption

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Potholes on Chicago's Lake Shore Drive, one of which is about half-a-car-length long and at least a foot deep. The city of Chicago says it has filled an estimated 240,000 potholes this winter, 100,000 more than last winter, at a cost of more than $2.8 million. David Schaper/NPR hide caption

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A Boeing 787 performs a demonstration flight in 2013. Battery fires, software failures and incomplete pieces have plagued the new high-tech plane. Francois Mori/AP hide caption

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