All rail links from Hong Kong to Chinese mainland and all portst in Shenzhen have been cuting since Jan 30 2020 as the coronavirus.
Due to the COVID-19 domestic outbreak has been temporarily contained, starting on Mar 25, China has been resuming normal operation of road traffic and rail services in Hubei province, the country's hardest-hit region by the coronavirus. Except Wuhan, other parts of HuBei province end their lockdown on Mar 25. But China is facing a mounting threat from imported infections. The total number of imported COVID-19 cases reached 427 by Mar 24.
China tightens inbound travel restrictions, and requires that all overseas arrivals, including Beijing, Shanghai , Guangzhou and Shenzhen, take a nucleic acid test and being quarantined in designated facilities for 14 days. Travelers are expected to cover the costs of the quarantine.
China also has decided to temporarily suspend the entry into China by foreign nationals holding valid visas or residence permits after Mar 28 2020. But entry with diplomatic, service, courtesy or C visas will not be affected.