Now a days trains have offline signaling. The train driver will have to look for the signal manually and take an action according to the signal available. If by any chance if he misses a signal that can be very fatal. So if there is a direct signaling mechanism to get the signal inside the train itself then its really useful in saving a lot of lives.
The concept is to setup a short range transmitter on every signaling pole so that the train can pick up the signal as it approaches the pole. Any of the commercial wireless communication protocols can be used. Wifi or long range bluetooth becomes the best candidates. The signaling poles can be reached through the railnet optical fibre cables or by using satellite relays.
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