I want to buy a train ticket to Shanghai. Could you please guide me on how to proceed? Firstly, I would like to check the available train schedules and their respective prices. It would be helpful if there is an option to compare different routes and their timings. Additionally, I need to know if there are any special requirements or documents needed for the purchase, especially if I am traveling during peak seasons. Lastly, could you provide information on how to make the payment and receive the ticket? Thank you for your assistance.