Your question implies FIXYA operates a bus in South Africa. (Of course, it does not, and perhaps you mistakenly worded your question in error due to a language difference.)
Unfortunately, you have worded your question as if FIXYA internet users live in South Africa and know the train and bus schedules there.
Using the internet to search, there are several bus services in that part of South Africa.
Perhaps you can call the Gautrain help number to ask for assistance, or search the internet for bus schedules.https://www.gautrain.co.za/
Gautrain Helpline telephone number:
0800 428 87246
Monday to Sunday between 05:30 am and 20:00 pm