That's not the locomotive's horn, or even a "real" horn at all. It's a wayside horn system, which uses a recording of a horn at crossings that are in otherwise quiet zones. The WHS is aimable, so the sound is directed only at the road (or the path in this case) on both sides of the crossing. That way, the residents nearby don't get a loud horn in their home.
Why does the horn sound like that ???
That's not the locomotive's horn, or even a "real" horn at all. It's a wayside horn system, which uses a recording of a horn at crossings that are in otherwise quiet zones. The WHS is aimable, so the sound is directed only at the road (or the path in this case) on both sides of the crossing. That way, the residents nearby don't get a loud horn in their home.