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You can apply the double decker design if you follow the Dutch NS trains, a split-style deck system where the doors are in the "middle" of the two floors.
Pros:
>More capacity (especially in high-density layout)
>No need for stupid double-floor doors
Cons:
>Potential wasted space near the door areas and stairs
>Longer times at station to accommodate for passengers needing to exit cars due to higher volume
Actually, a double-deck metro seems like a stupid idea.
