Which Trains in China have Deluxe Soft Sleeper (2 berth)

Last year we travelled on many trains in China and we loved it. One train from Xian to Shanghai had Deluxe Soft Sleeper (2 berth). Can you tell me which other trains in China have these Deluxe Soft Sleepers (2 berths). We'd like to come back to China. Thank you. Gary