Wants to go to Nanjing and Lhasa from shanghai pls suggest possible trains and availability of tickets

From Shanghai to Nanjing, great many trains are operating. Among them, it just takes around 1hr by the high-speed trains. On Nanjing-Lhasa route, one train T164/T165 is available which costs about 44hrs. For the availability of the tickets, it is better for you to make an online booking enquiry with your specific departure date.