Why is it difficult to tell whether the train is moving or not during a snowstorm?

Mechanical movement is a change in the position of the body relative to other bodies. The body relative to which the body changes its position is called the reference point.
In a strong snowstorm, the passenger who sits inside the train cannot see the reference body. He does not see whether the train changes its position relative to other bodies or does not change, whether the train is moving or not moving.

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