Train Air Horn Kit; Three Huge Trumpet Flat-Rack, Heavy Duty 150 PSI Compressor Flat Rack Mount Triple Train Horn w/ 12 volt electronic solenoid. Overall Horn Dimensions: 19.5" x 17.5" x 5.5". Trumpet Lengths: 16.25", 14", 12". 150 PSI All-in-one Onboard Air System w/ 2 gallon Tank Pre-mounted pressure switch and tank fittings Air line, push-button & mounting hardware Free Wiring Kit!