What does 3 short honks mean?

One short blast tells other boaters, “I intend to pass you on my left (port) side.” Two short blasts tell other boaters, “I intend to pass you on my right (starboard) side.” Three short blasts tell other boaters, “I am operating astern propulsion.” For some vessels, this tells other boaters, “I am backing up.”



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Motormen rarely press the horns three times but when they do, it means they have lost control over the motor and that the guard has to immediately pull the vacuum brake.

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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!

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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.

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Two short and one long horn This sound means that a passenger has pulled a chain or the guard has pulled a vacuum break.

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If for no other reason, the horn can alert those folks to get to safety. either to alert people when they enter the tunnel(like MOW, or trespassers) or in some cases, to be friendly at kids(or railfans) at the tunnel entrance.

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The change in air temperature affects the way sound travels. Since sound waves travel faster in warm air than in cool air, sound traveling through a temperature inversion bends.

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