Changsha to Zhangjiaje by train

Just remind you that there is no direct bullet train from HK to Changsha. You need a transfer at Guangzhou. (take Hong Kong – Guangzhou Through Trains to Guangzhou East; take bus/subway to Guangzhou South to take high speed train to Changsha) There are 7 trains run from Changsha to ZJJ every day, respectively in 02:17, 03:37, 04:59, 07:50, 08:02, 20:30, 22:26 and it takes around 5.5h. You can arrange your schedule according to your train arrival time.

Here is another choice: you take train from HK to Guangzhou East. And then reach Guangzhou Railway Station, from the station you can take train T8316 to ZJJ directly in around 12.5h.