Communications-based train control (CBTC) is a railway signaling system that makes use of telecommunications between the train and track equipment for traffic management and infrastructure control. By means of CBTC systems, the position of a train is known more accurately than with traditional signaling systems. This results in a more efficient and safe way to manage railway traffic. Metros (and other railway systems) are able to improve headways while maintaining or even improving safety.
A CBTC system is a "continuous, automatic train control system utilizing high-resolution train location determination, independent from track circuits; continuous, high-capacity, bidirectional train-to-wayside data communications; and trainborne and wayside processors capable of implementing automatic train protection (ATP) functions, as well as optional automatic train operation (ATO) and automatic train supervision (ATS) functions," as defined in the IEEE 1474 standard.
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