Why does my teacher collect our train tickets?

Nowadays, teachers’ project funds are all approved by higher authorities, and they cannot get money without reimbursement vouchers, so they collect things that can be reimbursed through various means, and train tickets are one of them. There is nothing to object to. If the money is not given to the teacher, it might be given to someone else. It is better to let the teacher hold it. If you don't need the train ticket, just give it to him. You have nothing to lose and the teacher is happy.