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> elevators

How are the elevators any more of a problem than in buildings, where they are commonplace, often for much taller structures (i.e., many more floors), and not considered a major expense?

Edit: Thanks, good points about the volume/throughput.




A subway station needs to be able to handle, during rush hour, bursts of 100 people arriving every 2-3 minutes. A building generally does not.

This is why even deep subway stations usually go with multiple levels of escalators to keep the flow of people moving continuously.


Metro stations have enormous throughput in comparison to a building.




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