While you can physically install a train horn on a motorcycle, it is generally illegal for street use in 2026 across most jurisdictions. Most vehicle codes (such as the CMVR in India or DMV rules in the US) state that a horn must be "audible" but not "unreasonably loud" or "disturbing." Train horns typically exceed 140 decibels (dB), which is far above the legal limit for civilian vehicles—usually capped at 100–115 dB. Using one on a public road can result in heavy fines, vehicle impoundment, or a failed safety inspection. Beyond the legal issues, the high "power draw" of a compressed air horn can strain a motorcycle's small electrical system, requiring a separate relay and air tank that are difficult to mount safely. For 2026 riders seeking more volume for safety, the "pro-tip" is to install a dual-tone electric air horn (like a Denali SoundBomb), which provides a loud, car-like blast that is street-legal while still being significantly more effective than a stock "meep-meep" horn.