jis
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In the NYC block system that was used it would be MO notifying Nich, and Nich notifying Grand Central. Nich was the tower that sat astride the tracks just west/north of the point where the tracks enter the Park Avenue tunnels. The whole thing was under supervision of the train director at MO, but Nich executed on the final tunnel track assignment based on the final arrival track that was assigned to each train in GCT. Sometimes the original plan for a train would get modified as late as Nich due to the way things evolved after the plan was made.
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