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VSMITH <br /> <br />The system does not have to be as complicated as you state. What works well and is being used now is a computer on board the locomotive (or transit car), which they already have. Along the ROW is small radio transmitters that tell the train what the speed limit is for the upcoming section. That information, along with the track signals gives the computer everything it needs to operate safely in the next stretch of track. The computers are set up so that if a signal is not received from a transmitter in a certain period of time then the train is stopped and must be restarted by a person.
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