Train noises are in the frequency of 400-4000 Hz [14] . ... Mobility of people has significantly increased. Daily and occasional trips consume a significant time in our whole life span. A comfortable and safe travel is prime need of any individual.
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The train noise at the out- door location contains quite strong low-frequency components, with the peak sound energy within the 50 to 160 Hz frequency range. Fig. 4 also shows that the train noise at this outdoor location also has significant energy at frequencies ranging from 160 Hz to 5,000 Hz.
There are two things that can be considered: one is trivial - that it is quieter at night so you are more likely to hear the horn. The second is physics: the speed of sound depends on the square root of temperature, so the refractive index is proportional to T-1/2.
INNACCURATE FREQUENCY RATINGSA typical bass train horn is in the range of 277-494hz (C# (3rd)–B (4th)). The Nathan AirChime K-series (most popular authentic train horns) are in the range of 311-622hz. Most high-pitch small size horns are in the 740-1975hz range.
It has to do with the height and strength of a temperature inversion just above the ground. On clear, calm nights, it is cooler at the ground than higher up. When air warms with altitude a temperature inversion exists. Sound travels faster in warm air than it does in cool air.
Today, the only whistle signals you're likely to hear regularly are the grade-crossing warning (which is also often used to warn employees or others on the tracks); two (or three) shorts to indicate the engineer has received a signal to start the train forward (or backward); and one long blast when a train is ...
Sound travels faster in warm air than it does in cool air. This means the sound of a train horn will bend downward when it passes through an inversion causing sound waves to propagate farther than normal.