1. Online ticketing platform: The online ticketing platform will provide electronic invoices, provide invoice numbers when purchasing, and print paper invoices.
2. Station window: When buying tickets at the station window, you can ask the conductor for the invoice, provide the invoice number and print the paper invoice.
3. Self-service ticket vending machine: When purchasing tickets on the self-service ticket vending machine, you can select the "reimbursement voucher" option to print paper invoices.