The Difference between T7 and Z19 train ?

Hi, the Z-train is Direct Express Train which will run from the departure city to the arrival city directly without any stop, as for the T-train will run at a high speed but have several stops. For the detailed info. about the Z-train and T-train, please check our following website.
https://www.travelchinaguide.com/china-trains/types.htm
As for the soft sleeper, each compartment on the train has four bunks - two upper and two lower. A door separates the compartment from the aisle to keep quiet and comfort. You could check the following page for details:https://www.travelchinaguide.com/china-trains/tickets.htm