How can I know or identify the frequency (daily, weekly...) of the train in "China Train Time Table"

A certain train has a fixed starting time and the train will start everyday according to the time table.

I Plain to get ticket TRAIN "K626" from XI'AN to YICHANG on Apr/9th - depart 08:50 and arrive 23:38 same day. I want to take a YANGTZE RIVER CRUISE (upstream) on Apr/10th. So I need to garantee that this train will be available this exactly day to I will stay in Yichang on time to get the cruise.
I read that the letter "A" or "B" after the number of train mean that is dialy. But in CNVOL time table doesn't show this information in K626 train.
Could you please inform if this train frequency is dialy and if my intend above will be possible ?