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At real, there is no difference with Single Deck ones as the working style. There are 2 cars one related top another and the top one is for even floors of the construct. The system also needs escalators for the circulation between the floors. Person who wants to reach even floors needs to use the even floor cab and usually it is the upper one. So, there is inreased reaching time with higher speed and developed new system.

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13y ago

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