why revolving?
Climate control.
Negligible. Flow control during busy times
latest photos of future 45th/Madison entrance
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When you enter GCT via the 270 Park Ave entrance, there are around 3 sets of locked steel doors. Looking through the gaps reveals a concourse that is being renovated. The path to the LIRR concourse is open and there is a hallway that takes you to another in-building entrance (I think its the 1 Vanderbilt one) that enables access to the main MNRR and Subway connections.
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They had to close down the concourse after running out of buckets to collect water dripping from the ceiling.
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