What is the ringtone of the short message played on the subway?

Go east to A, and you can find it for miles. You can also directly search Nanjing Station Radio Station in Wan Li and Wan Li and record it, but first listen to whether it is what you want. It should be a pre-broadcast reminder, right? It's called "Dong 'e", which was introduced from Japan, and high-speed rail broadcasting will also be used. I hope the answer can help you, thank you.