Switch lights also called colored lights, signal lights, railway signal lamp, signal lamp switch. Because each dialects of different names also varied.Switch indicator lamp for railway transportation, train operation and shunting operation instructions. Switch sign lamp is very common in the railway line, every certain distance, it will have lights, remain elevated station signal, when the vehicle through there will be induced color change, through the switch indicator lamp changes do indicate that a vehicle traffic. In the evening when it can be used as a direction for the direction of the train. Some are also used on the partial height of the buildings, used to indicate direction.
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