Will not be quarantined now. According to relevant public information, since June 2, 2023 1, isolation measures will no longer be implemented, and centralized entry isolation will be cancelled. Now that the new national policy has been liberalized, there is no need for isolation.
Now Shantou is a low-risk area, and you don't need a nucleic acid test certificate by train. You don't need a nucleic acid test certificate to go out of Shantou, as long as the health code is green and healthy.