They were also a [railfan](https://en.wikipedia.org/wiki/Railfan), and their nickname originated from Shenzhen Metro Line 8 (also known as the Yantian Line).
By coincidence, before they celebrated their 23rd birthday, Line 8 Phase 2 opened on 27 December 2023, which extended the line from Yantian Road to Xiaomeisha.
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