No direct trains are operating from Kashgar to Shanghai. By train, you need to make a transfer at Urumqi. For example, Kashgar-Urumqi, K9788/K9785, is departing at 13:16 and arriving at 13:44 on the next day, with the ticket price for one soft sleeper around CNY529. From Urumqi to Shanghai, only the train T54/T51 is available which takes about 44hrs and costs approximately 1079RMB for one lower soft sleeper.