Edit: according to comments, it may not be true or maybe partially true.

    • LifeInMultipleChoice@lemmy.world
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      2 days ago

      That makes me wonder if it is tied to the fact that you walk onto it like a train. The train or bus being a moving platform while the roof being irrelevant, as the second floor of the bus may not even have a roof. It would make sense to say you got in the bus though…