Kleinn Air Horns 502 Triple Train Horn - Chrome Three Trumpets, 16-Inches, 14-Inches and 11-Inches Authentic Train Horn Sound Requires 150-PSI Onboard Air System (Not Included) VX6003 Solenoid Valve With Wider Orifice And 1/2-Inch Tubing For Increased Volume Up To 152.2 Decibel Output