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Through the colors on the back, passengers can successfully find the train they will get on. Directional colors on the back of the ticket show which platform the train is. Different colors show different platforms and different trains.Passengers can go to the right platform through the color on the back of the ticket.The bulletin board on the platform can show the information on coming trains through directional colors.The directional colors of LED board are inlaid into the platform. And passengers can see the color easily.