Does that mean you can take the high-speed train if you can buy a ticket?

As long as the ticket is booked and paid, the system will also send a text message to inform the ticket information, indicating that the ticket purchase is successful and you can take the high-speed train. You can go to the railway station with your ID card when you arrive by bus. If the ticket is not purchased successfully, the system will not send the ticket information, so you can't take the high-speed train. If you can't buy tickets online, you can go to the window and try again. The window can't buy tickets, which means there is a reason.