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Contrôle de Vitesse par Balises , abbreviated to KVB is a train protection system used in France and in London St. Pancras International station. It checks and controls the speed of moving trains.
KVB consists of:
The on-board computer generates two speed-thresholds based on the received signals from the balises. If the train is over the speed limit, passing the first speed-threshold, an audible alarm sounds and the control panel indicates to the driver to adjust the train speed without delay. If the second speed threshold is passed, the KVB automatically engages emergency brakes on the train.
The system is an adaptation of a similar system that was used in Sweden, which uses an Intel 8085 microprocessor. The first generation French KVB also used this technology.