Explain: We can feel an approaching railway train by putting our ear in contact with rail before we hear its sound through air.

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Solution

Sound is a mechanical wave that requires a medium for transfer. It is a form of energy that can be transferred through various forms of matter (solid, liquid, and gas).
Sound waves travel faster in solids due to the high dense packing of particles in the solids and least in the gases.
Hence in the case of an approaching train, the vibration of movement of the train can be felt through the train tracks first and later heard through the air, as sound travels faster in solids (train tracks) than in gas (air).

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