<P> 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 ) . </P>
<P> 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 ) . </P>
when are trains required to blow their horns
when are trains required to blow their horns
at all public grade crossings
at all public grade crossings