In calm weather, the smoke from the chimney of the building rises vertically, and from the chimney of a moving steam locomotive

In calm weather, the smoke from the chimney of the building rises vertically, and from the chimney of a moving steam locomotive it spreads over the train. Why?

Above the stationary chimney of the building, in the same place, there is a convection flow of warm air that rises upward. The pipe of a moving steam locomotive throws out warm air on different sections of the road, which rises very slowly upward. When the train moves quickly, smoke spreads over it.

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