Question

what change did the narrator observe in engine and wheels as a train approaches station​

Answer 1

Answer:

If you have ever been near a train when it starts to move, you see (and hear) something interesting. The engine car at the front starts to move and in doing so, you get this wave of compressing couplings between all the cars. This was the source of a recent Car Talk puzzler. 

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Answer 2

Answer:

change of their state from motion to rest

Explanation:

the engine sound will become low and wheel will slowly stop