The Importance Of Train Horns To Safety
Train horns have been in use as long as have locomotives. They are used by engineers to alert motorists and pedestrians that the train is nearing a crossing, to inform passengers that the train will be departing the station and of course, to clear animals off of the tracks before a train comes through. Train horns are used by rail company workers during switching operations and when performing track work to let approaching trains know of their presence.
When internal combustion began to power the locomotives, the air horns from trucks were used but were not loud enough to be heard over the powerful diesel engines that the locomotives were using. The truck horn design was then upgraded by the railroad company, using oscillation to push the air through a power chamber and vibrate against a nozzle. The position of the diaphragm will allow more air or less air and the constant oscillation of the diaphragm creates waves of air that causes it to produce the sound of the horn. The North American locomotives that were manufactured before 1990 still used the old manual pull cord technique that was known as feathering, which just meant modulation was possible for the horns loudness. During the 1990s locomotive began using pushbutton controls and a pedal was built into the cab below the floor and when the pedal was pressed, it sounded the train horn.
In the past few years, train horns have become a sort of fad with many vehicle customizers for their own personal trucks and vans. Train horns are not manufactured for private use because people know that when they hear one there is usually a train coming, and if a train horn is used in normal traffic it tends to cause accidents, and in many places, it is against the law to operate a train horn. Train horns themselves have even come under scrutiny as some communities have developed quiet zones, and the engineers were instructed only to sound the horns in case of an emergency. Because of these laws, many automobile and pedestrian accidents have happened. With the speed of a train, and the amount of weight behind the engine a train hitting and automobile is like a truck running over an aluminum can, the can will be flattened.
The patterns to the sounds of train horns have different meanings depending on the rail company, as well the country.
In the U.S., the standard signal given by train horns at a crossing is two long horn sounds, followed by one short and one long. This pattern is repeated until the train has passed the crossing. In Florida, there was a ban on the use of train horns in many locales; however, this ban was lifted in only a few years because of the greatly increased rate of train accidents.
Even though a lot of people find the sound of a train horn to be an imposition, they have an important safety function and can save lives. Because of this, it is likely that quiet zones will become less and less common as more people understand the important function performed by train horns.