The meaning of Railway signal Light
Railway signals are usually displayed in different colors such as lights. Red yellow and green are used as the basic colors of the signal in our country and the moon white and blue are used as the auxiliary colors of the signal. The three basic colors represent red-stop, yellow-watch or slow-down, green-running at specified speeds. Itundefineds basically the same as a car, but sometimes it needs two lights, such as red and yellow, yellow and white, and yellow green, some are just shown on the locomotive of course.