Cats are not allowed on high-speed trains or regular trains. According to relevant regulations of China's railway authorities, live animals, including cats and other pets, are not permitted to be brought into the carriages. This is for public health and safety reasons, and to prevent potential animal escapes.
If your cat needs to travel with you, you can choose to have it checked in as cargo. Checking in usually requires preparing the necessary quarantine certificates in advance and placing the cat in a special container. The specific process may include purchasing tickets, preparing the necessary documents, and arriving at the station a certain amount of time in advance to complete the check-in procedures.
