Is that a real freight train coming? Nope, it's just you with this interesting alternative to traditional truck train horns. Everyone will hear you coming with this Polished Brass Train Whistle. Mounting hardware and 1/2" compression fitting included. Operating range from 30 PSI to 120 PSI and up. Polished solid brass with shiny clear coat for protection. 100-110 decibels. 13"L x 5"W x 5 1/4"H.