Why is the bell of Tianjin subway exactly the same as that of Hangzhou subway?

There are many reasons why the stop signs of Tianjin subway and Hangzhou subway may be the same:

1. may all use the products of the same subway equipment supplier, so the ringtones are the same.

2. They may all use the same audio file, so as to play clear, interference-free and noise-free radio announcement sound at each site.

3. They may all make the station announcement sound in the same professional dubbing company to ensure the clarity of the station announcement sound and the accuracy of the time interval.

The above information is for reference only. If you need more detailed information, it is recommended to inquire on the relevant website or telephone consultation.