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Main article: Signaling of the New York City Subway. 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.
The New York City Subway is a large rapid transit system and has a large fleet of electric multiple unit rolling stock. As of November 2016, the New York City Subway has 6418 cars on the roster. The system maintains two separate fleets of passenger cars: one for the A Division (numbered) routes, the other for the B Division (lettered) routes.