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The MTA has plans to upgrade much of New York City Subway system from a fixed block signaling system to one with communications-based train control (CBTC) technology, which will control the speed and starting and stopping of subway trains.
Most trains on the New York City Subway are manually operated. As of 2022, the system currently uses automatic block signaling, with fixed wayside signals and automatic train stops. Many portions of the signaling system were installed between the 1930s and 1960s.