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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During his January State of the State address, Wisconsin Gov. Scott Walker made the case that extra money should be returned as property and income tax cuts; some Republicans say his proposal goes too far. Andy Manis/AP hide caption

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Amtrak trains on the Empire Builder route, which stops in Williston, N.D., have been facing long delays. Shannon Stapleton/Reuters/Landov hide caption

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A fireball goes up at the site of an oil train derailment in Casselton, N.D., in December. Bruce Crummy/AP hide caption

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Emerald ash borer larvae damage the ash trees they live in. Chicago Botanic Garden hide caption

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A company proposes shipping crude oil by barge across Lake Superior to keep up with the booming supply from North Dakota and Canada. Jack Rendulich/AP hide caption

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A police officer stands guard at the scene of a Metro-North passenger train derailment in the Bronx borough of New York on Dec. 1. John Minchillo/AP hide caption

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