The main East Japan Railway Company (JR East) station and the directly adjacent private railways have a total of 35 platforms, an underground arcade, above-ground arcade and numerous hallways with another 17 platforms (52 total) that can be accessed through hallways to five directly connected stations without surfacing outside. The entire above/underground complex has well over 200 exits.
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3.6 million passengers per day. Wikipedia:
The main East Japan Railway Company (JR East) station and the directly adjacent private railways have a total of 35 platforms, an underground arcade, above-ground arcade and numerous hallways with another 17 platforms (52 total) that can be accessed through hallways to five directly connected stations without surfacing outside. The entire above/underground complex has well over 200 exits.