What does it mean to make up the ticket by SMS?

Refers to the short message that appears after passengers get on the train without a train ticket and buy a train ticket on the train.

Make-up tickets are more common in Spring Festival travel rush peak, going out to work, and college students' term.

If you transfer midway, you need to explain the situation to the conductor before getting on the bus, and then make up the ticket.

If you need to extend the journey temporarily, at the beginning of the extension, you need to take the ticket when you get on the bus, find the conductor or conductor and ask for a replacement ticket.