I wish to take a train from HK international airport to Guangzhou - How? Is there a timetable?

There is no direct train from HKIA to Guangzhou. You need to take train from Hung Hom Station. You can take airport shuttle bus A21 from HKIA to Hung Hom directly, and then take train there to Guangzhou East Railway Station.

For a direct ride, many buses are arranged from HKIA to Guangzhou from 07:00 to 22:15. It takes around 4h to arrive.