Question

when we put our ear to a railway line we can hear the sound of an approaching train even when the train is far off but its sound cannot be heard through the air why

Answer 1

when we put our ear to a railway line we can hear the sound of an approaching tarin even when the train is far off but its sound cannot be haerd in air because the sound of speed is more in steel, railway line or in solid than the air .and vibration is also more in solid kinetic energy
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Answer 2

Explanation:

the sound could not be here because molecules in air are very lose as compared to the railway line made up of metal where molecules are tightly packed.

This we are able to here the sound from far away distance