So what kind of train is 1258? If I look here price is ￥287 for soft sleeper and it should be 1361km. If I look here ￥286 should be the price of a K Train, but why is there no K in front of the train number?
Will they have a heater and power outlets? Will they have a restaurant car?

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This is the plan:

Explanation: Day / Night

Day1 Arrive 10am Hongkong / Hongkong
Day2 Hongkong / Hongkong
Day3 Hongkong and Shenzhen / Shenzhen
Day4 Arrive Chengdu 11:30 / Chengdu
Day5 Arrive Lijiang 08:45 / Lijiang
Day6 Lijiang / Lijiang
Day7 Lijiang / Lijiang
Day8 Lijiang / Lijiang
Day9 Lijiang / Lijiang
Day10 Arrive Dali 12:00 / Dali
Day11 Dali / Board train to Kunming 20:53
Day12 Arrive Kunming 05:15, see the stone forest / Kunming
Day13 Board train to Zhangjiajie 07:00 / Train to Zhangjiajie
Day14 Arrive Zhangjiajie 04:30 / Zhangjiajie
Day15 Zhangjiajie / Zhangjiajie
Day16 Zhangjiajie / Zhangjiajie
Day17 Board train to Beijing 12:47 / Train to Beijing
Day18 Arrive Beijing 10:40 / Beijing
Day19 Beijing / Airport
Day20 Depart 2am

So I will have almost 5 full days in Lijiang, 1,5 days in Dali, just 1 in Kunming and 3 in Zhangjiajie. To much in a to short time or will it be doable? Some advice where to go in Lijiang or Zhangjiajie?
If I realize that I dont like to take the train anymore I could fly from Zhangjiajie to Beijing and get one more night in Beijing, too.