Railroads rely on trackside detectors like this one along a Union Pacific line in western Iowa, seen Dec. 15, 2023, to help spot mechanical problems on trains before they can cause derailments. (AP Photo/Josh Funk) **FILE**
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Railroads rely on trackside detectors like this one along a Union Pacific line in western Iowa, seen Dec. 15, 2023, to help spot mechanical problems on trains before they can cause derailments. (AP Photo/Josh Funk) **FILE**
