There are few other trains arriving at Guangzhou South at such early morning hours, seeing most high speed railways close at night and first morning trains take time to arrive.
From Shenzhen North, the first morning train, G1002, departs 7:00, arrives 7:30
From Zhuhai, C7602 departs 7:00, arrives 8:08
From Xinhui, C7702 departs 7:00, arrives 7:55
From Nanning, D3601 departs 7:00, arrives 11:03
From Guilin North, D2831 departs 8:00, arrives 10:42
From Changsha, G6011 departs 7:00, arrives 9:19