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Cab signalling
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=== Transponder === Transponder based systems make use of fixed antenna loops or beacons (called [[balise]]s) that transmit datagrams or other information to a train as it passes overhead. While similar to intermittent inductive systems, transponder based cab signalling transmit more information and can also receive information from the train to aid traffic management. The low cost of loops and beacons allows for a larger number of information points that may have been possible with older systems as well as finer grained signalling information. The British [[Automatic Train Protection]] was one example of this technology along with the more recent Dutch ATB-NG.
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