border formalities when entering China from Hong Kong by train

I am preparing for a trip from Hong Kong into Southern China. I am a European Union passport holder and will travel with a Chinese "L" (i.e. tourist) visa.

If I take a "Z" express train from Hong Kong (Hung Hom station) to Guangzhou, how do border formalities work? Where will passports and visa be checked and how much time to I have to reserve in order to catch a connecting train from Guangzhou safely?

For instance, this web site suggests 30-40 minutes for border formalities on a "pedestrian" route from Hong Kong to Shenzhen via Hong Kong MTR and Shenzhen subways. Is this a reasonable guess also for entries via direct train from Hong Kong to Guangzhou or can I expect to enter faster?

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Can you go from Hong Kong to China?

Hong Kong - Level 4: Do Not Travel. Reconsider travel to the People's Republic of China (PRC) due to arbitrary enforcement of local laws and COVID-19-related restrictions.

What are the rules for traveling to China?

All travelers, including U.S. citizens who enter China, are screened upon arrival and subject to a minimum 14-day quarantine. While restrictions around domestic travel within China have eased, local quarantine requirements can vary significantly between cities, and regulations can change very quickly.

Can foreigner enter China from Hong Kong?

- Passengers entering Mainland China from Hong Kong must undergo a COVID-19 nucleic acid test in a government-approved testing facility with either nasal swab or combined nasal and throat swab samples collected within 48 hours of the departure time of their flight and produce a negative test result at check-in.

How do you get from Hong Kong to China?

There are 4 ways to get from Hong Kong to China by train or car

Take the train from West Kowloon Station to Guiyang North Station.

Take the train from Guiyang North to Chongqing West Station.

High-Speed Train From China To Hong Kong - The Fastest Way To Cross The Border

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Images: Airam Dato-on, Tim Durgan, John Lee, John Lee