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It was most often painted on a board.
It is not clear just what you are trying to ask.
If we are in the train,some of the trains have compartments with displays showing the station name.when ever the train enters the railway station it's display the current station name.what type of technology is used ,such that it's display the station name on the screen in compartment of the train which is visible to the passengers and they know that it's some 'xyz' station
They sometimes use LED lights, and voice, to let you know what the next stop is, that's for buses and traines.Digital technology.
How it functions? Internally how it works? Like which type of components are used?
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