Train Horn

Can You Put a Train Horn on a Truck?

How Do Truck Air Horns Work?

Big vehicles like railroads, fire trucks, and semi-trailer trucks sometimes have air horns fitted. These automobiles have air horn systems built right in, which is why their horns are louder. These vehicles' suspension and braking systems use air, therefore installing a horn is straightforward.

Truck drivers can frequently alert people of their presence at a distance using these horns. Compressed air is passed through the horn and into a reed or a diaphragm by the horns. The blast of air causes the horn to vibrate, which sends sound waves into it. The sound is amplified by its unusual shape

Why Does a Truck Have a Train Horn?

A train horn is essentially a large locomotive's warning signal, an extremely loud air horn. The sound of a railway horn can be heard for several kilometers, depending on the circumstances. In situations like hot-shot towing or other transport of heavy loads, trucks are frequently equipped with train-style air horn systems to warn other road users. 

It is difficult to comprehend how different driving a large, powerful truck is from driving a typical passenger car if you have never done it. These massive vehicles need more area and space to maneuver and slow down, especially when carrying a trailer. Drivers must be able to warn other motorists as soon as feasible when necessary. A truck's horn may be heard by anyone up to 500 meters away with a train horn, as opposed to a few hundred feet with a typical automobile horn.

Truck drivers honk their horns to make themselves known to vehicles, pedestrians, and even wildlife. A quick toot of their horn can prevent an accident caused by a distracted motorist, stray animals, or pedestrians or cyclists who are not paying attention to their surroundings.

Although you could counter that a louder horn can boost safety, putting a train horn is frequently done only to add another aggressive modification. For many owners of large, loud trucks, a feeble horn just seems inappropriate. There are some people who simply enjoy being as annoying as possible, and they are installed purely to annoy or make people jump because they find it amusing.

What Is the Volume of a Truck Air Horn?

A truck air horn can be as loud as 150 decibels, compared to the average 100–110 decibel range for a passenger car horn. The scale is logarithmic, therefore there is a big difference between 100 and 150 decibels.

At 125 decibels, noises start to hurt people. Short-term exposure to noises louder than 140 decibels can harm people permanently. Fortunately, truck air horns should only be used outside and for brief periods of time, so there is little chance of harm or loss of hearing.

Is it Permissible For a Truck to Have an Air Horn?

Check the criteria based on your state because state vehicle regulations differ significantly from one another. Many police will stop you and issue a ticket for any change they deem unreasonable, however this is frequently contested because the definition of unreasonable is arbitrary.

It is important to think about the legality when and where you are using your horn. According to the majority of state regulations, drivers are only permitted to use their horns when it is reasonably necessary to ensure safe operation. Make sure you are aware of the laws that apply in your area. Therefore, you risk receiving a penalty if you use it to intimidate others or just to be loud.

A Real Train Horn Can Be Quite Loud

Train horns are extremely loud air horns that, on average, can emit between 130 and 150 decibels. These horns promote safety and warn drivers and pedestrians of the presence of the train, much as air horns on trucks. The majority of the time, you will hear them as a train draws near a road or pedestrian crossing. However, there are regulations against train horns in several towns and cities. When crossing railroads, keep an eye out for these quiet zones.

What Is the Price to Install a Train Horn in Your Truck? 

You may spend anywhere between $200 and more than $2,000 to have a train siren installed on your truck. An air tank and air compressor are necessary for a reliable train horn. The real train horn, as well as all the necessary wiring and hoses, are also required. You can buy starter packages that include all the tools you need.

You will have to shell out a good penny to have your kit professionally fitted if you do not feel confident installing things yourself or if you want the best results. But it will be worth every penny to see the expressions on people's faces as you honk your horn.

Other Techniques For Enhancing Your Truck Horn

There are a few simple fixes if you are not happy with the tone or volume of your truck's horn. To start, you can turn up the volume exactly like on your TV. Some factory truck horns have an adjustment dial where you can increase the volume, which is relatively uncommon. To access it, your truck's horn may need to be removed, but a simple clockwise turn will raise it.

If your horn lacks this dial, you will need to get a new one that is either louder or has a dial. You must turn off the electricity before wiring in the new horn. But it is a really easy technique that just about anyone with some DIY knowledge can attempt. You might need to utilize a mounting bracket to fasten your larger horn to your car. Before finishing the project, make sure you test the horn.


For truck drivers, installing a train horn on a vehicle can be a useful and safety-improving alteration. Compressed air is used in truck air horns to vibrate a reed or diaphragm, creating a loud and recognizable sound. Truck air horn systems in the train style are very useful for warning other drivers, especially when heavy loads are involved or more room is required for maneuvering. Compared to ordinary car horns, these loud horns can be heard from a far larger distance, effectively warning drivers, pedestrians, and even wildlife.