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Caltrain recently began installing regulator valves on locomotive horns to reduce noise levels. Horn blasts now will produce sound measured at 98 decibels, the low end of a federally mandated range.

Caltrain expects crews to take several weeks to install the valves on all of the agency’s 29 locomotives and 34 cab cars.

Train horns are regulated by the Federal Railroad Administration, which mandates horns’ decibel range, blast patterns and when a horn must be sounded.