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Answer to: when do trains have to blow their horns
at all public grade crossings
On April 27 , 2005 , the Federal Railroad Administration ( FRA ) , which enforces rail safety regulations , published the final rule on the use of locomotive horns at highway – rail grade crossings . Effective June 24 , 2005 , the rule requires that locomotive horns be sounded at all public grade crossings at least 15 seconds , but not more than 20 seconds before entering a crossing . This rule applies when the train speed is below 45 mph ( 70 km / h ) . At 45 mph or above , trains are still required to sound their horn at the designated location ( usually denoted with a whistle post ) .
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when do trains have to blow their horns
at all public grade crossings