Let everyone in your state know you are there with this Premium Triple Train Horn Kit from PacBrake! Why Train Horns? Why not! In some parts of the country, the idea of adding train horns to trucks has been around for years. In fact, there's a whole industry that has popped up offering these kits. To some, installing powerful horns on a daily driver may seem excessive, but if you're pulling a 15,000-pound trailer and you see a car about to pull in front of you, a simple warning blast can mean the difference between the driver noticing or hitting your rig.