What should I do if I book a train ticket online and get the ticket number?

Nothing, just use the second-generation ID card to get the ticket.

After purchasing tickets on 12306 website, when you need to exchange paper tickets, please follow the following steps:

(1) If you use the resident ID card to purchase tickets, you can go to the ticket window of the station, the railway ticket sales point or the station ticket vending machine with the original valid resident ID card of the passenger used when purchasing tickets.

(2) If the resident ID card can't be read automatically or other valid ID cards other than the resident ID card are used to purchase tickets, please bring the original valid ID card of the passenger and the order number (E+9 digits) used when purchasing tickets, go to the ticket window of the station or the railway ticket sales point authorized by the railway transportation enterprise, and the ticket seller will enter the ID number and order number and verify them.

(3) To purchase student tickets, please show your valid ID card and student ID card when you buy tickets with the student train ticket discount card (all original) at the station ticket window or the railway ticket sales point with the student train ticket discount card logo installed.

(4) If you need to buy tickets for disabled soldiers, please bring your valid ID card and People's Republic of China (PRC) (People's Republic of China (PRC)) disabled soldiers Certificate and People's Republic of China (PRC) (People's Republic of China (PRC)) Disabled People's Police Certificate (both originals) to the ticket window of the station where the discount card identifier is installed.

(5) If the valid ID information is inconsistent with the order number, the ticket cannot be exchanged. For student tickets and disabled soldiers tickets, check the discount (to be paid) voucher at the same time. Student tickets also need to reduce the number of preferential rides.