Two short and one long horn – This horn sound indicates two possibilities, which includes that either a passenger has pulled a chain or the guard has pulled a vacuum break.
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Two short whistles mean that the engineer acknowledges that he or she heard or saw a signal that affects movement. Three short ones mean that the engineer intends to make a reverse movement. Two long, one short and one long mean trains are approaching a highway or street crossing. And the list goes on.
It is the standard signal used when the train is about to move forward. Two long blasts of the horn are for warning anyone near the train that it is about to move forward. There are other standardized horn signals like three short blasts for the train about to move backward.
Locomotive horns are required to sound for 15-20 seconds before entering all public grade crossings, but not more than one-quarter mile in advance. The required pattern for blowing the horn is two long, one short and one long sounding horn, repeated as necessary until the locomotive clears the crossing.
Three short ones mean that the engineer intends to make a reverse movement. Two long, one short and one long mean trains are approaching a highway or street crossing. And the list goes on. So, while train whistles can sound nostalgic, they do have an important communication role in the railroad industry.
Train is stopping: Blow one short whistle. Train is approaching the station: Blow one long whistle for 3-10 seconds. Train is going to reverse: Blow three short whistles in a row. Train is going to move forward: Blow two short whistles.
So, as you can see from the name, all this honking business is pretty strict and obliges trains to make four blasts approximately 20 seconds before they reach a crossing. But that's not all! Trains whistles and horns are an effective method of communication!
The horn alerts people that a train is approaching a railroad crossing. It can also be used to warn animals or trespassers in our right-of-way along a section of track. Many people don't realize that federal and state regulations require us to sound the horn whenever we approach any crossing.
The reason that trains honk their horns so much at night is because it's dark and the trains aren't so easy to see. Even though the lights are on, we sometimes can't see them coming, especially around the many blind curves near or ahead of the train station.
One short honk: a friendly greeting or acknowledgement. Two short honks: a warning to pedestrians or other drivers. One long honk: a warning of danger or a hazard on the road. Two long honks: a signal to other drivers to pay attention or to start moving.
If you hear, two small horns, it means the motorman is asking the guard to direct the railway signal to start the train. In case you hear three smaller horns, it suggests that the motorman has lost control over the train. This also acts as a signal to pull the vacuum break immediately. This signal is rarely heard.
The general emergency alarm on the ship is recognised by 7 short ringings of the bell followed by a long ring or using the ship horn signal of 7 short blasts followed by 1 long blast.
Train horns are a form of communication. They also provide a safety function. They are not, as some people seem to think, noise makers to annoy people and keep them awake at night.