Train ticket change

After buying a train ticket, you cannot take the current train on the current day because of temporary events. You need to change the ticket to another one in the relevant window of the station. The ticket can only be changed once. The changed ticket does not have the right to change the ticket.
After a passenger buys a ticket, if he/she is not allowed to go to the station visa window before the train starts, he/she can go to the station visa window before the train starts to drive (or the designated window does not apply for the sales place) apply for advance or later bus visa procedures.
During the process of changing the late bus visa, no more than 2 hours after driving (group travelers must complete 48 hours before driving ).
The ticket validity period must not be extended. For example:
A train starts at on a certain station and ends at on the next day. The whole journey is 1490 km and runs for 32 hours. The first day is the second day of the train. The 1490 km is limited to three days (No. 1-3 ).
If you change to the same number of times on the 2nd, you will be able to get to the terminal at on the 3rd. You can change the number.
A train starts at on a certain station and ends at on the third day. The whole journey is 1490 km, and it runs for 25 hours. It takes three days by bus on the first day. The 1490 km is limited to three days (No. 1-3 ).
For example, if you want to change the number 2 to the same number of times, you can only get to the end of the station on the number 4, then you cannot change the same number of times, you need to change the car on the 2 day earlier, you must arrive at the end of the website before 24 hours on the third day.
There is no restriction on the validity period of the vehicle in advance, and the validity period is calculated from the actual day of the vehicle. For example:
A car purchased on the 10th day is valid for four days and valid for the 13th day. Change the 7-day ride, which is valid for 10 days.
When a passenger applies for a change at the departure site, the fare difference is added when the fare of the modified train fare is higher than the original fare. If the fare of the modified train fare is lower than the original fare, the fare difference is refunded.
When a passenger changes his or her ticket at the station, the station will take back the original ticket and send a new ticket.
You can apply for a change only once. No change is required for round-trip and connecting tickets.