Why are high-speed rail tickets from Xi'an to Hanzhong in May booked by appointment?

High-speed train tickets from Xi'an to Hanzhong can be purchased within 30 days, and tickets can be purchased by appointment after 30 days. <br/><br/>Help you, please click the green "Accept".

The earliest train ticket pre-sale time is within one month, and there is no pre-sale of train tickets for more than one month, so you have to buy a train ticket for May to make an appointment for you and wait in line to wait for the pre-sale time to buy it for you at the first time to the ticket. (Appointment to grab tickets is for whoever queues first to buy tickets first, and generally they can be bought.)<br/><br/>Help you, please click green to accept

There is a time limit for pre-sale of train tickets.

Train tickets are sold 30 days in advance. Only tickets before May 3 can be purchased on April 4, and tickets after that can only be reserved in advance (there is no guarantee that tickets will be obtained)